/**
  * Access this class's working instance.
  * If the instance hasn't been set, set it now.
  *
  * @wp-hook	void
  * @uses		void
  * @since		2.0.0
  * @return		object of this class
  */
 public static function get_instance()
 {
     if (null == self::$instance) {
         self::$instance = new self();
     }
     return self::$instance;
 }
 /**
  * Get our settings validation class.
  *
  * @wp-hook	void
  * @uses		void
  * @since		2.0.0
  * @return 	void
  */
 function get_validation()
 {
     // Include our settings validation class.
     require_once $this->plugin_dir_path . 'admin/assets/class-' . $this->prefix . '-validation.php';
     $this->validation = NGGOBASIC_Validation::get_instance();
     $this->validation->init();
 }