Created base files for value types.

src/engine/Types/Bool.php

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+<?php 
+
+/* ----------------------------------------------------------------------------
+ * Easy!Appointments - Open Source Web Scheduler
+ *
+ * @package     EasyAppointments
+ * @author      A.Tselegidis <alextselegidis@gmail.com>
+ * @copyright   Copyright (c) 2013 - 2016, Alex Tselegidis
+ * @license     http://opensource.org/licenses/GPL-3.0 - GPLv3
+ * @link        http://easyappointments.org
+ * @since       v1.2.0
+ * ---------------------------------------------------------------------------- */
+
+namespace \EA\Engine\Types; 
+
+class Bool extends Type {
+
+}

src/engine/Types/Double.php

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+<?php 
+
+/* ----------------------------------------------------------------------------
+ * Easy!Appointments - Open Source Web Scheduler
+ *
+ * @package     EasyAppointments
+ * @author      A.Tselegidis <alextselegidis@gmail.com>
+ * @copyright   Copyright (c) 2013 - 2016, Alex Tselegidis
+ * @license     http://opensource.org/licenses/GPL-3.0 - GPLv3
+ * @link        http://easyappointments.org
+ * @since       v1.2.0
+ * ---------------------------------------------------------------------------- */
+
+namespace \EA\Engine\Types; 
+
+class Double extends Type {
+
+}

src/engine/Types/Int.php

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+<?php 
+
+/* ----------------------------------------------------------------------------
+ * Easy!Appointments - Open Source Web Scheduler
+ *
+ * @package     EasyAppointments
+ * @author      A.Tselegidis <alextselegidis@gmail.com>
+ * @copyright   Copyright (c) 2013 - 2016, Alex Tselegidis
+ * @license     http://opensource.org/licenses/GPL-3.0 - GPLv3
+ * @link        http://easyappointments.org
+ * @since       v1.2.0
+ * ---------------------------------------------------------------------------- */
+
+namespace \EA\Engine\Types; 
+
+class Int extends Type {
+
+}

src/engine/Types/String.php

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+<?php 
+
+/* ----------------------------------------------------------------------------
+ * Easy!Appointments - Open Source Web Scheduler
+ *
+ * @package     EasyAppointments
+ * @author      A.Tselegidis <alextselegidis@gmail.com>
+ * @copyright   Copyright (c) 2013 - 2016, Alex Tselegidis
+ * @license     http://opensource.org/licenses/GPL-3.0 - GPLv3
+ * @link        http://easyappointments.org
+ * @since       v1.2.0
+ * ---------------------------------------------------------------------------- */
+
+namespace \EA\Engine\Types; 
+
+class String extends Type {
+
+}

src/engine/Types/Type.php

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+<?php 
+
+/* ----------------------------------------------------------------------------
+ * Easy!Appointments - Open Source Web Scheduler
+ *
+ * @package     EasyAppointments
+ * @author      A.Tselegidis <alextselegidis@gmail.com>
+ * @copyright   Copyright (c) 2013 - 2016, Alex Tselegidis
+ * @license     http://opensource.org/licenses/GPL-3.0 - GPLv3
+ * @link        http://easyappointments.org
+ * @since       v1.2.0
+ * ---------------------------------------------------------------------------- */
+
+namespace \EA\Engine\Types; 
+
+/**
+ * Abstract Type Class 
+ *
+ * This class needs to be extended by the type classes which must implement the validation logic.
+ */
+abstract class Type {
+    /**
+     * Class Constructor 
+     * 
+     * @param mixed $value The type value to be validated.
+     */
+    public function __construct($value) {
+        $this->_validate($value);
+        $this->value = $value; 
+    }
+
+    /**
+     * Get the type value. 
+     * 
+     * @return mixed
+     */
+    public function get() {
+        return $this->value;
+    }
+
+    /**
+     * Implement the validation logic in the children classes.
+     * 
+     * @throws \InvalidArgumentException If the validation fails.
+     */
+    abstract protected function _validate();
+}

src/engine/Types/UnsignedInt.php

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+<?php 
+
+/* ----------------------------------------------------------------------------
+ * Easy!Appointments - Open Source Web Scheduler
+ *
+ * @package     EasyAppointments
+ * @author      A.Tselegidis <alextselegidis@gmail.com>
+ * @copyright   Copyright (c) 2013 - 2016, Alex Tselegidis
+ * @license     http://opensource.org/licenses/GPL-3.0 - GPLv3
+ * @link        http://easyappointments.org
+ * @since       v1.2.0
+ * ---------------------------------------------------------------------------- */
+
+namespace \EA\Engine\Types; 
+
+class UnsignedInt extends Int {
+    
+}