private static function _initAutoloader()
 {
     if (!sgAutoloader::checkCache()) {
         $paths = array(sgContext::getLibDir());
         foreach (self::$enabledPlugins as $plugin) {
             $paths[] = sgContext::getRootDir() . '/plugins/' . $plugin->name . '/';
         }
         $paths[] = sgContext::getRootDir() . '/config/';
         $paths[] = sgContext::getRootDir() . '/lib/';
         $paths[] = sgContext::getRootDir() . '/controllers/';
         $paths[] = sgContext::getRootDir() . '/models/';
         sgAutoloader::setExclusions(self::get('settings.autoload_exclusions', array()));
         sgAutoloader::loadPaths($paths);
     }
     Twig_Autoloader::register();
 }