/**
  * Generates an instance of the class.
  * 
  * @since 2.0
  * 
  * @return Ultimate_Post_Types
  */
 public static function instance()
 {
     if (null == self::$instance) {
         self::$instance = new self();
     }
     return self::$instance;
 }
function upt_load()
{
    define('UPT_URL', plugins_url('/', __FILE__));
    define('UPT_DIR', dirname(__FILE__) . '/');
    define('UPT_VER', '2.0');
    require_once UPT_DIR . 'lib/class-ultimate-post-types.php';
    Ultimate_Post_Types::instance();
}