public function registerListenerNamespace($path)
    {
        if (false === isset($this->_namespaces['BackBee\Event\Listener'])) {
            $this->_namespaces['BackBee\Event\Listener'] = array();
        }

        array_unshift($this->_namespaces['BackBee\Event\Listener'], $path);

        return $this;
    }