diff --git a/.gitignore b/.gitignore
index 2306b20b..ab86d76e 100644
--- a/.gitignore
+++ b/.gitignore
@@ -9,6 +9,8 @@
 !/docker/.env.example
 /node_modules/
 /npm-debug.log
+/src/assets/js/**/*.min.js
+/src/assets/css/**/*.min.css
 /src/config.php
 /src/storage/cache/*
 !/src/storage/cache/.htaccess
diff --git a/docs/apigen/apigen.md b/docs/apigen/apigen.md
new file mode 100644
index 00000000..e69de29b
diff --git a/gulpfile.js b/gulpfile.js
index 867991c5..82c41f5f 100644
--- a/gulpfile.js
+++ b/gulpfile.js
@@ -1,114 +1,35 @@
-const gulp = require('gulp');
-const exec = require('child_process').execSync;
-const del = require('del');
-const fs = require('fs-extra');
-const path = require('path');
-const zip = require('zip-dir');
-
-/**
- * Install and copy the required files from the "composer_modules" directory.
+/* ----------------------------------------------------------------------------
+ * Easy!Appointments - Open Source Web Scheduler
  *
- * Composer needs to be installed and configured in order for this command to
- * work properly.
- */
-gulp.task('composer', function() {
-    del.sync([
-        './src/vendor/**/*',
-        '!./src/vendor/index.html'
-    ]);
+ * @package     EasyAppointments
+ * @author      A.Tselegidis <alextselegidis@gmail.com>
+ * @copyright   Copyright (c) 2013 - 2018, Alex Tselegidis
+ * @license     http://opensource.org/licenses/GPL-3.0 - GPLv3
+ * @link        http://easyappointments.org
+ * @since       v1.4.0
+ * ---------------------------------------------------------------------------- */
 
-    return gulp.src([
-        'vendor/**/*',
-        '!vendor/**/demo{,/**}',
-        '!vendor/**/{demo,docs,examples,test,tests,extras,language}{,/**}',
-        '!vendor/**/{composer.json,composer.lock,.gitignore}',
-        '!vendor/**/{*.yml,*.md,*phpunit*,*.mdown}',
-        '!vendor/bin{,/**}',
-        '!vendor/codeigniter{,/**}',
-        '!vendor/doctrine{,/**}',
-        '!vendor/myclabs{,/**}',
-        '!vendor/phpdocumentor{,/**}',
-        '!vendor/phpspec{,/**}',
-        '!vendor/phpunit{,/**}',
-        '!vendor/sebastian{,/**}',
-        '!vendor/symfony{,/**}',
-        '!vendor/webmozart{,/**}'
-    ])
-        .pipe(gulp.dest('./src/vendor/'));
-});
+// Gulp instance and plugins.
+const gulp = require('gulp');
+const plugins = require('gulp-load-plugins')();
 
-/**
- * Build the project and create an easyappointments.zip file ready for distribution.
- */
-gulp.task('build', function(done) {
-    del.sync([
-        'build',
-        'easyappointments-0.0.0.zip'
-    ]);
+// Gulp error handling.
+const source = gulp.src;
+gulp.src = function() {
+    return source.apply(gulp, arguments)
+        .pipe(plugins.plumber({
+            errorHandler: plugins.notify.onError('Error: <%= error.message %>')
+        }));
+};
 
-    fs.copySync('src', 'build');
-    fs.removeSync('build/config.php');
-    fs.copySync('CHANGELOG.md', 'build/CHANGELOG.md');
-    fs.copySync('README.md', 'build/README.md');
-    fs.copySync('LICENSE', 'build/LICENSE');
-
-    del.sync([
-        'build/storage/uploads/*',
-        '!build/storage/uploads/index.html'
-    ]);
-
-    del.sync([
-        'build/storage/logs/*',
-        '!build/storage/logs/index.html'
-    ]);
-
-    del.sync([
-        'build/storage/sessions/*',
-        '!build/storage/sessions/.htaccess',
-        '!build/storage/sessions/index.html'
-    ]);
-
-    del.sync([
-        'build/storage/cache/*',
-        '!build/storage/cache/.htaccess',
-        '!build/storage/cache/index.html'
-    ]);
-
-    zip('build', { saveTo: 'easyappointments-0.0.0.zip' }, function (err, buffer) {
-        if (err)
-            console.log('Zip Error', err);
-
-        done();
-    });
-});
-
-/**
- * Generate code documentation.
- */
-gulp.task('doc', function(done) {
-    fs.removeSync('docs/apigen/html');
-    fs.mkdirSync('docs/apigen/html');
-    fs.removeSync('docs/jsdoc/html');
-    fs.mkdirSync('docs/jsdoc/html');
-    fs.removeSync('docs/plato/html');
-    fs.mkdirSync('docs/plato/html');
-
-    const commands = [
-        'php docs/apigen/apigen.phar generate ' +
-            '-s "src/application/controllers,src/application/models,src/application/libraries" ' +
-            '-d "docs/apigen/html" --exclude "*external*" --tree --todo --template-theme "bootstrap"',
-
-        path.join('.', 'node_modules', '.bin', 'jsdoc') + ' "src/assets/js" -d "doc/jsdoc/html"',
-
-        path.join('.', 'node_modules', '.bin', 'plato') + ' -r -d "docs/plato/html" "src/assets/js"'
-    ];
-
-    commands.forEach(function(command) {
-        exec(command, function (err, stdout, stderr) {
-            console.log(stdout);
-            console.log(stderr);
-        });
-    });
-
-    done();
-});
+// Define gulp tasks.
+gulp.task('build', require('./tools/gulp/build')(gulp, plugins));
+gulp.task('clean', require('./tools/gulp/clean')(gulp, plugins));
+gulp.task('composer', require('./tools/gulp/composer')(gulp, plugins));
+gulp.task('dev', require('./tools/gulp/dev')(gulp, plugins));
+gulp.task('docs', require('./tools/gulp/docs')(gulp, plugins));
+gulp.task('scripts', require('./tools/gulp/scripts')(gulp, plugins));
+gulp.task('styles', require('./tools/gulp/styles')(gulp, plugins));
+gulp.task('tests', require('./tools/gulp/tests')(gulp, plugins));
+gulp.task('watch', require('./tools/gulp/watch')(gulp, plugins));
+gulp.task('default', ['dev']);
diff --git a/package-lock.json b/package-lock.json
index 2119fcc0..cab67c6c 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -4,6 +4,12 @@
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
+    "abbrev": {
+      "version": "1.1.1",
+      "resolved": "https://registry.npmjs.org/abbrev/-/abbrev-1.1.1.tgz",
+      "integrity": "sha512-nne9/IiQ/hzIhY6pdDnbBtz7DjPTKrY00P/zvPSm5pOFkl6xuGrGnXn/VtTNNfNtAfZ9/1RtehkszU9qcTii0Q==",
+      "dev": true
+    },
     "acorn": {
       "version": "5.2.1",
       "resolved": "https://registry.npmjs.org/acorn/-/acorn-5.2.1.tgz",
@@ -43,12 +49,48 @@
       "integrity": "sha1-MU3QpLM2j609/NxU7eYXG4htrzw=",
       "dev": true
     },
+    "ansi-colors": {
+      "version": "1.1.0",
+      "resolved": "http://registry.npmjs.org/ansi-colors/-/ansi-colors-1.1.0.tgz",
+      "integrity": "sha512-SFKX67auSNoVR38N3L+nvsPjOE0bybKTYbkf5tRvushrAPQ9V75huw0ZxBkKVeRU9kqH3d6HA4xTckbwZ4ixmA==",
+      "dev": true,
+      "requires": {
+        "ansi-wrap": "^0.1.0"
+      }
+    },
+    "ansi-cyan": {
+      "version": "0.1.1",
+      "resolved": "https://registry.npmjs.org/ansi-cyan/-/ansi-cyan-0.1.1.tgz",
+      "integrity": "sha1-U4rlKK+JgvKK4w2G8vF0VtJgmHM=",
+      "dev": true,
+      "requires": {
+        "ansi-wrap": "0.1.0"
+      }
+    },
     "ansi-escapes": {
       "version": "1.4.0",
       "resolved": "https://registry.npmjs.org/ansi-escapes/-/ansi-escapes-1.4.0.tgz",
       "integrity": "sha1-06ioOzGapneTZisT52HHkRQiMG4=",
       "dev": true
     },
+    "ansi-gray": {
+      "version": "0.1.1",
+      "resolved": "https://registry.npmjs.org/ansi-gray/-/ansi-gray-0.1.1.tgz",
+      "integrity": "sha1-KWLPVOyXksSFEKPetSRDaGHvclE=",
+      "dev": true,
+      "requires": {
+        "ansi-wrap": "0.1.0"
+      }
+    },
+    "ansi-red": {
+      "version": "0.1.1",
+      "resolved": "https://registry.npmjs.org/ansi-red/-/ansi-red-0.1.1.tgz",
+      "integrity": "sha1-jGOPnRCAgAo1PJwoyKgcpHBdlGw=",
+      "dev": true,
+      "requires": {
+        "ansi-wrap": "0.1.0"
+      }
+    },
     "ansi-regex": {
       "version": "2.1.1",
       "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-2.1.1.tgz",
@@ -61,6 +103,12 @@
       "integrity": "sha1-tDLdM1i2NM914eRmQ2gkBTPB3b4=",
       "dev": true
     },
+    "ansi-wrap": {
+      "version": "0.1.0",
+      "resolved": "https://registry.npmjs.org/ansi-wrap/-/ansi-wrap-0.1.0.tgz",
+      "integrity": "sha1-qCJQ3bABXponyoLoLqYDu/pF768=",
+      "dev": true
+    },
     "archy": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/archy/-/archy-1.0.0.tgz",
@@ -91,6 +139,12 @@
       "integrity": "sha512-L3hKV5R/p5o81R7O02IGnwpDmkp6E982XhtbuwSe3O4qOtMMMtodicASA1Cny2U+aCXcNpml+m4dPsvsJ3jatg==",
       "dev": true
     },
+    "arr-union": {
+      "version": "2.1.0",
+      "resolved": "https://registry.npmjs.org/arr-union/-/arr-union-2.1.0.tgz",
+      "integrity": "sha1-IPnqtexw9cfSFbEHexw5Fh0pLH0=",
+      "dev": true
+    },
     "array-differ": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/array-differ/-/array-differ-1.0.0.tgz",
@@ -136,6 +190,12 @@
       "integrity": "sha1-iYUI2iIm84DfkEcoRWhJwVAaSw0=",
       "dev": true
     },
+    "assign-symbols": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/assign-symbols/-/assign-symbols-1.0.0.tgz",
+      "integrity": "sha1-WWZ/QfrdTyDMvCu5a41Pf3jsA2c=",
+      "dev": true
+    },
     "async": {
       "version": "1.5.2",
       "resolved": "https://registry.npmjs.org/async/-/async-1.5.2.tgz",
@@ -235,6 +295,15 @@
       "integrity": "sha512-UZK3NBx2Mca+b5LsG7bY183pHWt5Y1xts4P3Pz7ENTwGVnJOUWbRb3ocjvX7hx9tq/yTAdclXm9sZ38gNuem4A==",
       "dev": true
     },
+    "clean-css": {
+      "version": "4.2.1",
+      "resolved": "https://registry.npmjs.org/clean-css/-/clean-css-4.2.1.tgz",
+      "integrity": "sha512-4ZxI6dy4lrY6FHzfiy1aEOXgu4LIsW2MhwG0VBKdcoGoH/XLFgaHSdLTGr4O8Be6A8r3MOphEiI8Gc1n0ecf3g==",
+      "dev": true,
+      "requires": {
+        "source-map": "~0.6.0"
+      }
+    },
     "cli": {
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/cli/-/cli-1.0.1.tgz",
@@ -309,6 +378,27 @@
       "integrity": "sha1-DQcLTQQ6W+ozovGkDi7bPZpMz3c=",
       "dev": true
     },
+    "color-convert": {
+      "version": "1.9.3",
+      "resolved": "https://registry.npmjs.org/color-convert/-/color-convert-1.9.3.tgz",
+      "integrity": "sha512-QfAUtd+vFdAtFQcC8CCyYt1fYWxSqAiK2cSD6zDB8N3cpsEBAvRxp9zOGg6G/SHHJYAT88/az/IuDGALsNVbGg==",
+      "dev": true,
+      "requires": {
+        "color-name": "1.1.3"
+      }
+    },
+    "color-name": {
+      "version": "1.1.3",
+      "resolved": "https://registry.npmjs.org/color-name/-/color-name-1.1.3.tgz",
+      "integrity": "sha1-p9BVi9icQveV3UIyj3QIMcpTvCU=",
+      "dev": true
+    },
+    "color-support": {
+      "version": "1.1.3",
+      "resolved": "https://registry.npmjs.org/color-support/-/color-support-1.1.3.tgz",
+      "integrity": "sha512-qiBjkpbMLO/HL68y+lh4q0/O1MZFj2RX6X/KmMa3+gJD3z+WwI1ZzDHysvqHGS3mP6mznPckpXmw1nI9cJjyRg==",
+      "dev": true
+    },
     "commander": {
       "version": "2.11.0",
       "resolved": "https://registry.npmjs.org/commander/-/commander-2.11.0.tgz",
@@ -898,6 +988,23 @@
       "integrity": "sha1-p1Xqe8Gt/MWjHOfnYtuq3F5jZEQ=",
       "dev": true
     },
+    "extend-shallow": {
+      "version": "1.1.4",
+      "resolved": "https://registry.npmjs.org/extend-shallow/-/extend-shallow-1.1.4.tgz",
+      "integrity": "sha1-Gda/lN/AnXa6cR85uHLSH/TdkHE=",
+      "dev": true,
+      "requires": {
+        "kind-of": "^1.1.0"
+      },
+      "dependencies": {
+        "kind-of": {
+          "version": "1.1.0",
+          "resolved": "http://registry.npmjs.org/kind-of/-/kind-of-1.1.0.tgz",
+          "integrity": "sha1-FAo9LUGjbS78+pN3tiwk+ElaXEQ=",
+          "dev": true
+        }
+      }
+    },
     "extglob": {
       "version": "0.3.2",
       "resolved": "https://registry.npmjs.org/extglob/-/extglob-0.3.2.tgz",
@@ -913,12 +1020,13 @@
       "integrity": "sha1-Ys8SAjTGg3hdkCNIqADvPgzCC8A="
     },
     "fancy-log": {
-      "version": "1.3.0",
-      "resolved": "https://registry.npmjs.org/fancy-log/-/fancy-log-1.3.0.tgz",
-      "integrity": "sha1-Rb4X0Cu5kX1gzP/UmVyZnmyMmUg=",
+      "version": "1.3.2",
+      "resolved": "https://registry.npmjs.org/fancy-log/-/fancy-log-1.3.2.tgz",
+      "integrity": "sha1-9BEl49hPLn2JpD0G2VjI94vha+E=",
       "dev": true,
       "requires": {
-        "chalk": "^1.1.1",
+        "ansi-gray": "^0.1.1",
+        "color-support": "^1.1.3",
         "time-stamp": "^1.0.0"
       }
     },
@@ -1105,6 +1213,12 @@
         }
       }
     },
+    "function-bind": {
+      "version": "1.1.1",
+      "resolved": "https://registry.npmjs.org/function-bind/-/function-bind-1.1.1.tgz",
+      "integrity": "sha512-yIovAzMX49sF8Yl58fSCWJ5svSLuaibPxXQJFLmBObTuCr0Mf1KiPopGM9NiFjiYBCbfaa2Fh6breQ6ANVTI0A==",
+      "dev": true
+    },
     "gaze": {
       "version": "0.5.2",
       "resolved": "https://registry.npmjs.org/gaze/-/gaze-0.5.2.tgz",
@@ -1129,6 +1243,12 @@
         "is-property": "^1.0.0"
       }
     },
+    "get-own-enumerable-property-symbols": {
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/get-own-enumerable-property-symbols/-/get-own-enumerable-property-symbols-3.0.0.tgz",
+      "integrity": "sha512-CIJYJC4GGF06TakLg8z4GQKvDsx9EMspVxOYih7LerEL/WosUnFIww45CGfxfeKHqlg3twgUrYRT1O3WQqjGCg==",
+      "dev": true
+    },
     "glob": {
       "version": "4.0.6",
       "resolved": "https://registry.npmjs.org/glob/-/glob-4.0.6.tgz",
@@ -1350,9 +1470,9 @@
       }
     },
     "glogg": {
-      "version": "1.0.0",
-      "resolved": "https://registry.npmjs.org/glogg/-/glogg-1.0.0.tgz",
-      "integrity": "sha1-f+DxmfV6yQbPUS/urY+Q7kooT8U=",
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/glogg/-/glogg-1.0.1.tgz",
+      "integrity": "sha512-ynYqXLoluBKf9XGR1gA59yEJisIL7YHEH4xr3ZziHB5/yl4qWfaK8Js9jGe6gBGCSCKVqiyO30WnRZADvemUNw==",
       "dev": true,
       "requires": {
         "sparkles": "^1.0.0"
@@ -1366,6 +1486,12 @@
         "natives": "^1.1.0"
       }
     },
+    "growly": {
+      "version": "1.3.0",
+      "resolved": "https://registry.npmjs.org/growly/-/growly-1.3.0.tgz",
+      "integrity": "sha1-8QdIy+dq+WS3yWyTxrzCivEgwIE=",
+      "dev": true
+    },
     "gulp": {
       "version": "3.9.1",
       "resolved": "https://registry.npmjs.org/gulp/-/gulp-3.9.1.tgz",
@@ -1387,6 +1513,275 @@
         "vinyl-fs": "^0.3.0"
       }
     },
+    "gulp-changed": {
+      "version": "3.2.0",
+      "resolved": "https://registry.npmjs.org/gulp-changed/-/gulp-changed-3.2.0.tgz",
+      "integrity": "sha1-zumGbZSeCRh1IlI9bGVWX24yvXw=",
+      "dev": true,
+      "requires": {
+        "make-dir": "^1.1.0",
+        "pify": "^3.0.0",
+        "plugin-error": "^0.1.2",
+        "replace-ext": "^1.0.0",
+        "through2": "^2.0.0",
+        "touch": "^3.1.0"
+      },
+      "dependencies": {
+        "pify": {
+          "version": "3.0.0",
+          "resolved": "https://registry.npmjs.org/pify/-/pify-3.0.0.tgz",
+          "integrity": "sha1-5aSs0sEB/fPZpNB/DbxNtJ3SgXY=",
+          "dev": true
+        }
+      }
+    },
+    "gulp-clean-css": {
+      "version": "3.10.0",
+      "resolved": "https://registry.npmjs.org/gulp-clean-css/-/gulp-clean-css-3.10.0.tgz",
+      "integrity": "sha512-7Isf9Y690o/Q5MVjEylH1H7L8WeZ89woW7DnhD5unTintOdZb67KdOayRgp9trUFo+f9UyJtuatV42e/+kghPg==",
+      "dev": true,
+      "requires": {
+        "clean-css": "4.2.1",
+        "plugin-error": "1.0.1",
+        "through2": "2.0.3",
+        "vinyl-sourcemaps-apply": "0.2.1"
+      },
+      "dependencies": {
+        "arr-diff": {
+          "version": "4.0.0",
+          "resolved": "https://registry.npmjs.org/arr-diff/-/arr-diff-4.0.0.tgz",
+          "integrity": "sha1-1kYQdP6/7HHn4VI1dhoyml3HxSA=",
+          "dev": true
+        },
+        "arr-union": {
+          "version": "3.1.0",
+          "resolved": "https://registry.npmjs.org/arr-union/-/arr-union-3.1.0.tgz",
+          "integrity": "sha1-45sJrqne+Gao8gbiiK9jkZuuOcQ=",
+          "dev": true
+        },
+        "extend-shallow": {
+          "version": "3.0.2",
+          "resolved": "https://registry.npmjs.org/extend-shallow/-/extend-shallow-3.0.2.tgz",
+          "integrity": "sha1-Jqcarwc7OfshJxcnRhMcJwQCjbg=",
+          "dev": true,
+          "requires": {
+            "assign-symbols": "^1.0.0",
+            "is-extendable": "^1.0.1"
+          }
+        },
+        "is-extendable": {
+          "version": "1.0.1",
+          "resolved": "https://registry.npmjs.org/is-extendable/-/is-extendable-1.0.1.tgz",
+          "integrity": "sha512-arnXMxT1hhoKo9k1LZdmlNyJdDDfy2v0fXjFlmok4+i8ul/6WlbVge9bhM74OpNPQPMGUToDtz+KXa1PneJxOA==",
+          "dev": true,
+          "requires": {
+            "is-plain-object": "^2.0.4"
+          }
+        },
+        "plugin-error": {
+          "version": "1.0.1",
+          "resolved": "https://registry.npmjs.org/plugin-error/-/plugin-error-1.0.1.tgz",
+          "integrity": "sha512-L1zP0dk7vGweZME2i+EeakvUNqSrdiI3F91TwEoYiGrAfUXmVv6fJIq4g82PAXxNsWOp0J7ZqQy/3Szz0ajTxA==",
+          "dev": true,
+          "requires": {
+            "ansi-colors": "^1.0.1",
+            "arr-diff": "^4.0.0",
+            "arr-union": "^3.1.0",
+            "extend-shallow": "^3.0.2"
+          }
+        }
+      }
+    },
+    "gulp-debug": {
+      "version": "4.0.0",
+      "resolved": "https://registry.npmjs.org/gulp-debug/-/gulp-debug-4.0.0.tgz",
+      "integrity": "sha512-cn/GhMD2nVZCVxAl5vWao4/dcoZ8wUJ8w3oqTvQaGDmC1vT7swNOEbhQTWJp+/otKePT64aENcqAQXDcdj5H1g==",
+      "dev": true,
+      "requires": {
+        "chalk": "^2.3.0",
+        "fancy-log": "^1.3.2",
+        "plur": "^3.0.0",
+        "stringify-object": "^3.0.0",
+        "through2": "^2.0.0",
+        "tildify": "^1.1.2"
+      },
+      "dependencies": {
+        "ansi-styles": {
+          "version": "3.2.1",
+          "resolved": "https://registry.npmjs.org/ansi-styles/-/ansi-styles-3.2.1.tgz",
+          "integrity": "sha512-VT0ZI6kZRdTh8YyJw3SMbYm/u+NqfsAxEpWO0Pf9sq8/e94WxxOpPKx9FR1FlyCtOVDNOQ+8ntlqFxiRc+r5qA==",
+          "dev": true,
+          "requires": {
+            "color-convert": "^1.9.0"
+          }
+        },
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       "resolved": "https://registry.npmjs.org/pluralize/-/pluralize-1.2.1.tgz",
@@ -2646,9 +3216,9 @@
       "dev": true
     },
     "replace-ext": {
-      "version": "0.0.1",
-      "resolved": "https://registry.npmjs.org/replace-ext/-/replace-ext-0.0.1.tgz",
-      "integrity": "sha1-KbvZIHinOfC8zitO5B6DeVNSKSQ=",
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/replace-ext/-/replace-ext-1.0.0.tgz",
+      "integrity": "sha1-3mMSg3P8v3w8z6TeWkgMRaZ5WOs=",
       "dev": true
     },
     "require-uncached": {
@@ -2786,6 +3356,12 @@
       "integrity": "sha1-7GIRvtGSBEIIj+D3Cyg3Iy7SyKg=",
       "dev": true
     },
+    "shellwords": {
+      "version": "0.1.1",
+      "resolved": "https://registry.npmjs.org/shellwords/-/shellwords-0.1.1.tgz",
+      "integrity": "sha512-vFwSUfQvqybiICwZY5+DAWIPLKsWO31Q91JSKl3UYv+K5c2QRPzn0qzec6QPu1Qc9eHYItiP3NdJqNVqetYAww==",
+      "dev": true
+    },
     "sigmund": {
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/sigmund/-/sigmund-1.0.1.tgz",
@@ -2797,10 +3373,16 @@
       "integrity": "sha1-7b+JA/ZvfOL46v1s7tZeJkyDGzU=",
       "dev": true
     },
+    "source-map": {
+      "version": "0.6.1",
+      "resolved": "https://registry.npmjs.org/source-map/-/source-map-0.6.1.tgz",
+      "integrity": "sha512-UjgapumWlbMhkBgzT7Ykc5YXUT46F0iKu8SGXq0bcwP5dz/h0Plj6enJqjz1Zbq2l5WaqYnrVbwWOWMyF3F47g==",
+      "dev": true
+    },
     "sparkles": {
-      "version": "1.0.0",
-      "resolved": "https://registry.npmjs.org/sparkles/-/sparkles-1.0.0.tgz",
-      "integrity": "sha1-Gsu/tZJDbRC76PeFt8xvgoFQEsM=",
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/sparkles/-/sparkles-1.0.1.tgz",
+      "integrity": "sha512-dSO0DDYUahUt/0/pD/Is3VIm5TGJjludZ0HVymmhYF6eNA53PVLhnUk0znSYbH8IYBuJdCE+1luR22jNLMaQdw==",
       "dev": true
     },
     "sprintf-js": {
@@ -2837,6 +3419,17 @@
       "integrity": "sha1-YuIDvEF2bGwoyfyEMB2rHFMQ+pQ=",
       "dev": true
     },
+    "stringify-object": {
+      "version": "3.3.0",
+      "resolved": "https://registry.npmjs.org/stringify-object/-/stringify-object-3.3.0.tgz",
+      "integrity": "sha512-rHqiFh1elqCQ9WPLIC8I0Q/g/wj5J1eMkyoiD6eoQApWHP0FtlK7rqnhmabL5VUY9JQCcqwwvlOaSuutekgyrw==",
+      "dev": true,
+      "requires": {
+        "get-own-enumerable-property-symbols": "^3.0.0",
+        "is-obj": "^1.0.1",
+        "is-regexp": "^1.0.0"
+      }
+    },
     "strip-ansi": {
       "version": "3.0.1",
       "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-3.0.1.tgz",
@@ -2955,25 +3548,31 @@
           "integrity": "sha1-u5NdSFgsuhaMBoNJV6VKPgcSTxE=",
           "dev": true
         },
+        "process-nextick-args": {
+          "version": "2.0.0",
+          "resolved": "https://registry.npmjs.org/process-nextick-args/-/process-nextick-args-2.0.0.tgz",
+          "integrity": "sha512-MtEC1TqN0EU5nephaJ4rAtThHtC86dNN9qCuEhtshvpVBkAW5ZO7BASN9REnF9eoXGcRub+pFuKEpOHE+HbEMw==",
+          "dev": true
+        },
         "readable-stream": {
-          "version": "2.3.3",
-          "resolved": "https://registry.npmjs.org/readable-stream/-/readable-stream-2.3.3.tgz",
-          "integrity": "sha512-m+qzzcn7KUxEmd1gMbchF+Y2eIUbieUaxkWtptyHywrX0rE8QEYqPC07Vuy4Wm32/xE16NcdBctb8S0Xe/5IeQ==",
+          "version": "2.3.6",
+          "resolved": "http://registry.npmjs.org/readable-stream/-/readable-stream-2.3.6.tgz",
+          "integrity": "sha512-tQtKA9WIAhBF3+VLAseyMqZeBjW0AHJoxOtYqSUZNJxauErmLbVm2FW1y+J/YA9dUrAC39ITejlZWhVIwawkKw==",
           "dev": true,
           "requires": {
             "core-util-is": "~1.0.0",
             "inherits": "~2.0.3",
             "isarray": "~1.0.0",
-            "process-nextick-args": "~1.0.6",
+            "process-nextick-args": "~2.0.0",
             "safe-buffer": "~5.1.1",
-            "string_decoder": "~1.0.3",
+            "string_decoder": "~1.1.1",
             "util-deprecate": "~1.0.1"
           }
         },
         "string_decoder": {
-          "version": "1.0.3",
-          "resolved": "https://registry.npmjs.org/string_decoder/-/string_decoder-1.0.3.tgz",
-          "integrity": "sha512-4AH6Z5fzNNBcH+6XDMfA/BTt87skxqJlO0lAh3Dker5zThcAxG6mKz+iGu308UKoPPQ8Dcqx/4JhujzltRa+hQ==",
+          "version": "1.1.1",
+          "resolved": "https://registry.npmjs.org/string_decoder/-/string_decoder-1.1.1.tgz",
+          "integrity": "sha512-n/ShnvDi6FHbbVfviro+WojiFzv+s8MPMHBczVePfUpDJLwoLT0ht1l4YwBCbi8pJAveEEdnkHyPyTP/mzRfwg==",
           "dev": true,
           "requires": {
             "safe-buffer": "~5.1.0"
@@ -2996,6 +3595,15 @@
       "integrity": "sha1-dkpaEa9QVhkhsTPztE5hhofg9cM=",
       "dev": true
     },
+    "touch": {
+      "version": "3.1.0",
+      "resolved": "https://registry.npmjs.org/touch/-/touch-3.1.0.tgz",
+      "integrity": "sha512-WBx8Uy5TLtOSRtIq+M03/sKDrXCLHxwDcquSP2c43Le03/9serjQBIztjRz6FkJez9D/hleyAXTBGLwwZUw9lA==",
+      "dev": true,
+      "requires": {
+        "nopt": "~1.0.10"
+      }
+    },
     "trumbowyg": {
       "version": "2.10.0",
       "resolved": "https://registry.npmjs.org/trumbowyg/-/trumbowyg-2.10.0.tgz",
@@ -3085,6 +3693,24 @@
       "integrity": "sha1-hN1eHQG0QRm95JPqZW3O+JJVq4Q=",
       "dev": true
     },
+    "uglify-js": {
+      "version": "3.4.9",
+      "resolved": "https://registry.npmjs.org/uglify-js/-/uglify-js-3.4.9.tgz",
+      "integrity": "sha512-8CJsbKOtEbnJsTyv6LE6m6ZKniqMiFWmm9sRbopbkGs3gMPPfd3Fh8iIA4Ykv5MgaTbqHr4BaoGLJLZNhsrW1Q==",
+      "dev": true,
+      "requires": {
+        "commander": "~2.17.1",
+        "source-map": "~0.6.1"
+      },
+      "dependencies": {
+        "commander": {
+          "version": "2.17.1",
+          "resolved": "https://registry.npmjs.org/commander/-/commander-2.17.1.tgz",
+          "integrity": "sha512-wPMUt6FnH2yzG95SA6mzjQOEKUU3aLaDEmzs1ti+1E9h+CsrZghRlqEM/EJ4KscsQVG8uNN4uVreUeT8+drlgg==",
+          "dev": true
+        }
+      }
+    },
     "unc-path-regex": {
       "version": "0.1.2",
       "resolved": "https://registry.npmjs.org/unc-path-regex/-/unc-path-regex-0.1.2.tgz",
@@ -3150,6 +3776,14 @@
         "clone": "^1.0.0",
         "clone-stats": "^0.0.1",
         "replace-ext": "0.0.1"
+      },
+      "dependencies": {
+        "replace-ext": {
+          "version": "0.0.1",
+          "resolved": "https://registry.npmjs.org/replace-ext/-/replace-ext-0.0.1.tgz",
+          "integrity": "sha1-KbvZIHinOfC8zitO5B6DeVNSKSQ=",
+          "dev": true
+        }
       }
     },
     "vinyl-fs": {
@@ -3208,6 +3842,23 @@
         }
       }
     },
+    "vinyl-sourcemaps-apply": {
+      "version": "0.2.1",
+      "resolved": "https://registry.npmjs.org/vinyl-sourcemaps-apply/-/vinyl-sourcemaps-apply-0.2.1.tgz",
+      "integrity": "sha1-q2VJ1h0XLCsbh75cUI0jnI74dwU=",
+      "dev": true,
+      "requires": {
+        "source-map": "^0.5.1"
+      },
+      "dependencies": {
+        "source-map": {
+          "version": "0.5.7",
+          "resolved": "https://registry.npmjs.org/source-map/-/source-map-0.5.7.tgz",
+          "integrity": "sha1-igOdLRAh0i0eoUyA2OpGi6LvP8w=",
+          "dev": true
+        }
+      }
+    },
     "vows": {
       "version": "0.8.1",
       "resolved": "https://registry.npmjs.org/vows/-/vows-0.8.1.tgz",
diff --git a/package.json b/package.json
index 7474cc66..640e53f5 100644
--- a/package.json
+++ b/package.json
@@ -22,7 +22,19 @@
     "del": "^2.2.0",
     "fs-extra": "^0.26.3",
     "gulp": "^3.9.0",
+    "gulp-changed": "^3.2.0",
+    "gulp-clean-css": "^3.10.0",
+    "gulp-debug": "^4.0.0",
+    "gulp-load-plugins": "^1.5.0",
+    "gulp-notify": "^3.2.0",
+    "gulp-plumber": "^1.2.0",
+    "gulp-rename": "^1.4.0",
+    "gulp-shell": "^0.6.5",
+    "gulp-sync": "^0.1.4",
+    "gulp-uglify": "^3.0.1",
+    "gulp-util": "^3.0.8",
     "jsdoc": "^3.5.5",
+    "node-notifier": "^5.3.0",
     "plato": "^1.5.0",
     "zip-dir": "^1.0.0"
   },
@@ -41,5 +53,11 @@
     "qtip2": "^3.0.3",
     "sticky-table-headers": "^0.1.19",
     "trumbowyg": "^2.10.0"
+  },
+  "scripts": {
+    "start": "gulp",
+    "build": "gulp build",
+    "docs": "gulp docs",
+    "tests": "gulp tests"
   }
 }
diff --git a/tools/gulp/build.js b/tools/gulp/build.js
new file mode 100644
index 00000000..d57b8a21
--- /dev/null
+++ b/tools/gulp/build.js
@@ -0,0 +1,58 @@
+/* ----------------------------------------------------------------------------
+ * Easy!Appointments - Open Source Web Scheduler
+ *
+ * @package     EasyAppointments
+ * @author      A.Tselegidis <alextselegidis@gmail.com>
+ * @copyright   Copyright (c) 2013 - 2018, Alex Tselegidis
+ * @license     http://opensource.org/licenses/GPL-3.0 - GPLv3
+ * @link        http://easyappointments.org
+ * @since       v1.4.0
+ * ---------------------------------------------------------------------------- */
+
+const del = require('del');
+const fs = require('fs-extra');
+const zip = require('zip-dir');
+
+module.exports = (gulp, plugins) => {
+    return (done) => {
+        del.sync([
+            'build',
+            'easyappointments-0.0.0.zip'
+        ]);
+
+        fs.copySync('src', 'build');
+        fs.removeSync('build/config.php');
+        fs.copySync('CHANGELOG.md', 'build/CHANGELOG.md');
+        fs.copySync('README.md', 'build/README.md');
+        fs.copySync('LICENSE', 'build/LICENSE');
+
+        del.sync([
+            'build/storage/uploads/*',
+            '!build/storage/uploads/index.html'
+        ]);
+
+        del.sync([
+            'build/storage/logs/*',
+            '!build/storage/logs/index.html'
+        ]);
+
+        del.sync([
+            'build/storage/sessions/*',
+            '!build/storage/sessions/.htaccess',
+            '!build/storage/sessions/index.html'
+        ]);
+
+        del.sync([
+            'build/storage/cache/*',
+            '!build/storage/cache/.htaccess',
+            '!build/storage/cache/index.html'
+        ]);
+
+        zip('build', {saveTo: 'easyappointments-0.0.0.zip'}, function (err, buffer) {
+            if (err)
+                console.log('Zip Error', err);
+
+            done();
+        });
+    };
+};
diff --git a/tools/gulp/clean.js b/tools/gulp/clean.js
new file mode 100644
index 00000000..6ab1f7bc
--- /dev/null
+++ b/tools/gulp/clean.js
@@ -0,0 +1,21 @@
+/* ----------------------------------------------------------------------------
+ * Easy!Appointments - Open Source Web Scheduler
+ *
+ * @package     EasyAppointments
+ * @author      A.Tselegidis <alextselegidis@gmail.com>
+ * @copyright   Copyright (c) 2013 - 2018, Alex Tselegidis
+ * @license     http://opensource.org/licenses/GPL-3.0 - GPLv3
+ * @link        http://easyappointments.org
+ * @since       v1.4.0
+ * ---------------------------------------------------------------------------- */
+
+const del = require('del');
+
+module.exports = (gulp, plugins) => {
+    return () => {
+        del.sync([
+            'src/assets/js/**/*.min.js',
+            'src/assets/css/**/*.min.css'
+        ])
+    };
+};
diff --git a/tools/gulp/composer.js b/tools/gulp/composer.js
new file mode 100644
index 00000000..8eee7408
--- /dev/null
+++ b/tools/gulp/composer.js
@@ -0,0 +1,46 @@
+/* ----------------------------------------------------------------------------
+ * Easy!Appointments - Open Source Web Scheduler
+ *
+ * @package     EasyAppointments
+ * @author      A.Tselegidis <alextselegidis@gmail.com>
+ * @copyright   Copyright (c) 2013 - 2018, Alex Tselegidis
+ * @license     http://opensource.org/licenses/GPL-3.0 - GPLv3
+ * @link        http://easyappointments.org
+ * @since       v1.4.0
+ * ---------------------------------------------------------------------------- */
+
+const del = require('del');
+
+/**
+ * Install and copy the required files from the "composer_modules" directory.
+ *
+ * Composer needs to be installed and configured in order for this command to
+ * work properly.
+ */
+module.exports = (gulp, plugins) => {
+    return () => {
+        del.sync([
+            './src/vendor/**/*',
+            '!./src/vendor/index.html'
+        ]);
+
+        return gulp.src([
+            'vendor/**/*',
+            '!vendor/**/demo{,/**}',
+            '!vendor/**/{demo,docs,examples,test,tests,extras,language}{,/**}',
+            '!vendor/**/{composer.json,composer.lock,.gitignore}',
+            '!vendor/**/{*.yml,*.md,*phpunit*,*.mdown}',
+            '!vendor/bin{,/**}',
+            '!vendor/codeigniter{,/**}',
+            '!vendor/doctrine{,/**}',
+            '!vendor/myclabs{,/**}',
+            '!vendor/phpdocumentor{,/**}',
+            '!vendor/phpspec{,/**}',
+            '!vendor/phpunit{,/**}',
+            '!vendor/sebastian{,/**}',
+            '!vendor/symfony{,/**}',
+            '!vendor/webmozart{,/**}'
+        ])
+            .pipe(gulp.dest('./src/vendor/'));
+    };
+};
diff --git a/tools/gulp/dev.js b/tools/gulp/dev.js
new file mode 100644
index 00000000..bd1f7f71
--- /dev/null
+++ b/tools/gulp/dev.js
@@ -0,0 +1,20 @@
+/* ----------------------------------------------------------------------------
+ * Easy!Appointments - Open Source Web Scheduler
+ *
+ * @package     EasyAppointments
+ * @author      A.Tselegidis <alextselegidis@gmail.com>
+ * @copyright   Copyright (c) 2013 - 2018, Alex Tselegidis
+ * @license     http://opensource.org/licenses/GPL-3.0 - GPLv3
+ * @link        http://easyappointments.org
+ * @since       v1.4.0
+ * ---------------------------------------------------------------------------- */
+
+
+
+module.exports = (gulp, plugins) => {
+    const task = require('gulp-sync')(gulp);
+
+    return () => {
+        gulp.start(task.sync(['clean', 'scripts', 'styles', 'watch']), 'dev');
+    };
+};
diff --git a/tools/gulp/docs.js b/tools/gulp/docs.js
new file mode 100644
index 00000000..1440cd7d
--- /dev/null
+++ b/tools/gulp/docs.js
@@ -0,0 +1,47 @@
+/* ----------------------------------------------------------------------------
+ * Easy!Appointments - Open Source Web Scheduler
+ *
+ * @package     EasyAppointments
+ * @author      A.Tselegidis <alextselegidis@gmail.com>
+ * @copyright   Copyright (c) 2013 - 2018, Alex Tselegidis
+ * @license     http://opensource.org/licenses/GPL-3.0 - GPLv3
+ * @link        http://easyappointments.org
+ * @since       v1.4.0
+ * ---------------------------------------------------------------------------- */
+
+const exec = require('child_process').execSync;
+const fs = require('fs-extra');
+const path = require('path');
+
+/**
+ * Generate code documentation.
+ */
+module.exports = (gulp, plugins) => {
+    return (done) => {
+        fs.removeSync('docs/apigen/html');
+        fs.mkdirSync('docs/apigen/html');
+        fs.removeSync('docs/jsdoc/html');
+        fs.mkdirSync('docs/jsdoc/html');
+        fs.removeSync('docs/plato/html');
+        fs.mkdirSync('docs/plato/html');
+
+        const commands = [
+            'php docs/apigen/apigen.phar generate ' +
+            '-s "src/application/controllers,src/application/models,src/application/libraries" ' +
+            '-d "docs/apigen/html" --exclude "*external*" --tree --todo --template-theme "bootstrap"',
+
+            path.join('.', 'node_modules', '.bin', 'jsdoc') + ' "src/assets/js" -d "docs/jsdoc/html"',
+
+            path.join('.', 'node_modules', '.bin', 'plato') + ' -r -d "docs/plato/html" "src/assets/js"'
+        ];
+
+        commands.forEach(function (command) {
+            exec(command, function (err, stdout, stderr) {
+                console.log(stdout);
+                console.log(stderr);
+            });
+        });
+
+        done();
+    };
+};
diff --git a/tools/gulp/scripts.js b/tools/gulp/scripts.js
new file mode 100644
index 00000000..e5f49ac7
--- /dev/null
+++ b/tools/gulp/scripts.js
@@ -0,0 +1,24 @@
+/* ----------------------------------------------------------------------------
+ * Easy!Appointments - Open Source Web Scheduler
+ *
+ * @package     EasyAppointments
+ * @author      A.Tselegidis <alextselegidis@gmail.com>
+ * @copyright   Copyright (c) 2013 - 2018, Alex Tselegidis
+ * @license     http://opensource.org/licenses/GPL-3.0 - GPLv3
+ * @link        http://easyappointments.org
+ * @since       v1.4.0
+ * ---------------------------------------------------------------------------- */
+
+module.exports = (gulp, plugins) => {
+    return () => {
+        gulp.src([
+            'src/assets/js/**/*.js',
+            '!src/assets/js/**/*.min.js'
+        ])
+            .pipe(plugins.changed('src/assets/js/**/*'))
+            .pipe(plugins.uglify().on('error', plugins.util.log))
+            .pipe(plugins.rename({suffix: '.min'}))
+            .pipe(gulp.dest('src/assets/js'));
+    };
+};
+
diff --git a/tools/gulp/styles.js b/tools/gulp/styles.js
new file mode 100644
index 00000000..fc77c2e6
--- /dev/null
+++ b/tools/gulp/styles.js
@@ -0,0 +1,23 @@
+/* ----------------------------------------------------------------------------
+ * Easy!Appointments - Open Source Web Scheduler
+ *
+ * @package     EasyAppointments
+ * @author      A.Tselegidis <alextselegidis@gmail.com>
+ * @copyright   Copyright (c) 2013 - 2018, Alex Tselegidis
+ * @license     http://opensource.org/licenses/GPL-3.0 - GPLv3
+ * @link        http://easyappointments.org
+ * @since       v1.4.0
+ * ---------------------------------------------------------------------------- */
+
+module.exports = (gulp, plugins) => {
+    return () => {
+        gulp.src([
+            'src/assets/css/**/*.css',
+            '!src/assets/css/**/*.min.css'
+        ])
+            .pipe(plugins.changed('src/assets/css/**/*'))
+            .pipe(plugins.cleanCss())
+            .pipe(plugins.rename({suffix: '.min'}))
+            .pipe(gulp.dest('src/assets/css'));
+    };
+};
diff --git a/tools/gulp/tests.js b/tools/gulp/tests.js
new file mode 100644
index 00000000..32c9ddc7
--- /dev/null
+++ b/tools/gulp/tests.js
@@ -0,0 +1,16 @@
+/* ----------------------------------------------------------------------------
+ * Easy!Appointments - Open Source Web Scheduler
+ *
+ * @package     EasyAppointments
+ * @author      A.Tselegidis <alextselegidis@gmail.com>
+ * @copyright   Copyright (c) 2013 - 2018, Alex Tselegidis
+ * @license     http://opensource.org/licenses/GPL-3.0 - GPLv3
+ * @link        http://easyappointments.org
+ * @since       v1.4.0
+ * ---------------------------------------------------------------------------- */
+
+module.exports = (gulp, plugins) => {
+    return () => {
+        plugins.util.log('Not implemented yet.');
+    };
+};
diff --git a/tools/gulp/watch.js b/tools/gulp/watch.js
new file mode 100644
index 00000000..0e0611a6
--- /dev/null
+++ b/tools/gulp/watch.js
@@ -0,0 +1,24 @@
+/* ----------------------------------------------------------------------------
+ * Easy!Appointments - Open Source Web Scheduler
+ *
+ * @package     EasyAppointments
+ * @author      A.Tselegidis <alextselegidis@gmail.com>
+ * @copyright   Copyright (c) 2013 - 2018, Alex Tselegidis
+ * @license     http://opensource.org/licenses/GPL-3.0 - GPLv3
+ * @link        http://easyappointments.org
+ * @since       v1.4.0
+ * ---------------------------------------------------------------------------- */
+
+module.exports = (gulp, plugins) => {
+    return () => {
+        gulp.watch([
+            'src/assets/js/**/*.js',
+            '!src/assets/js/**/*.min.js'
+        ], ['scripts']);
+
+        gulp.watch([
+            'src/assets/css/**/*.css',
+            '!src/assets/css/**/*.min.css'
+        ], ['styles']);
+    };
+};