public function addComposerAutoloader(Varien_Event_Observer $observer)
    {
        if (self::$added === false) {
            /** @var Fontis_ComposerAutoloader_Helper_Data $helper */
            $helper = Mage::helper('fontis_composerautoloader');
            $helper->registerAutoloader();
            self::$added = true;
        }
    }