private function __construct()
 {
     set_exception_handler(array($this, '_exceptionHandler'));
     \GF\Loader::registerNamespace('GF', dirname(__FILE__) . DIRECTORY_SEPARATOR);
     \GF\Loader::registerAutoload();
     $this->config = \GF\Config::getInstance();
     if ($this->config->getConfigFolder() == null) {
         $this->setConfigFolder('../Config');
     }
 }