public static function on() {

        foreach(self::$classes as $k => $class) {
            if (!class_exists($class)) {
               if(class_exists('Prototypemvc\Core\\' . $class)) {
                    class_alias('Prototypemvc\Core\\' . $class, $class);
               } else if(class_exists('Prototypemvc\Helpers\\' . $class)) {
                    class_alias('Prototypemvc\Helpers\\' . $class, $class);
               }
            }
        }
    }