/**
  * @param string $name
  * @param string $dir
  */
 private function _registerExtension($name, $dir)
 {
     if (is_dir($lib = $dir . '/lib')) {
         $this->finder->addPsr0('Drupal\\' . $name . '\\', $lib);
         $this->finder->addPearFlat($name . '_', $lib);
     }
     if (is_dir($src = $dir . '/src')) {
         $this->finder->addPsr4('Drupal\\' . $name . '\\', $src);
     }
     $this->registered[$name] = TRUE;
 }