public function configSiteVariables(MvcEvent $event)
 {
     // Fetch configuration
     $config = $event->getApplication()->getServiceManager()->get("Config");
     $options = array_key_exists('application_settings', $config) ? $config['application_settings'] : [];
     $variables = new ModuleOptions($options);
     // Set configuration
     $event->getViewModel()->setVariables($variables->toArray());
 }