$app->get('/', function() use($app, $factory) {
   $js = $factory->createAsset(
      array('@javascript'),
      array('jsmin', 'jscompress')
   );
   $css = $factory->createAsset(
      array('@css'),
      array('cssmin')
   );
   return $app['twig']->render('default-route.twig', array(
       'js' => $js,
       'css' => $css
   ));
});

$app->run();