/**
  * Initialize all the custom Doctrime Extensions
  */
 protected function _initializeExtensions()
 {
     spl_autoload_register(array('Doctrine', 'extensionsAutoload'));
     $extention_dir = dirname(__FILE__) . '/Doctrine/Extensions';
     if ($handle = opendir($extention_dir)) {
         while (false !== ($file = readdir($handle))) {
             if (!preg_match('/^\\./', $file) && is_dir($extention_dir . '/' . $file)) {
                 $this->manager->registerExtension($file, $extention_dir . '/' . $file);
             }
         }
         closedir($handle);
     }
 }