Removed the aliases for classes

They are no longer needed as there is no conflict anymore with the
silex providers since their renaming. And changing the length of the
file fixes # 359

src/Silex/Provider/TwigServiceProvider.php

@@ -14,10 +14,10 @@ namespace Silex\Provider;
 use Silex\Application;
 use Silex\ServiceProviderInterface;
 
-use Symfony\Bridge\Twig\Extension\RoutingExtension as TwigRoutingExtension;
-use Symfony\Bridge\Twig\Extension\TranslationExtension as TwigTranslationExtension;
-use Symfony\Bridge\Twig\Extension\FormExtension as TwigFormExtension;
-use Symfony\Bridge\Twig\Extension\SecurityExtension as TwigSecurityExtension;
+use Symfony\Bridge\Twig\Extension\RoutingExtension;
+use Symfony\Bridge\Twig\Extension\TranslationExtension;
+use Symfony\Bridge\Twig\Extension\FormExtension;
+use Symfony\Bridge\Twig\Extension\SecurityExtension;
 
 /**
  * Twig Provider.
@@ -48,15 +48,15 @@ class TwigServiceProvider implements ServiceProviderInterface
 
             if (class_exists('Symfony\Bridge\Twig\Extension\RoutingExtension')) {
                 if (isset($app['url_generator'])) {
-                    $twig->addExtension(new TwigRoutingExtension($app['url_generator']));
+                    $twig->addExtension(new RoutingExtension($app['url_generator']));
                 }
 
                 if (isset($app['translator'])) {
-                    $twig->addExtension(new TwigTranslationExtension($app['translator']));
+                    $twig->addExtension(new TranslationExtension($app['translator']));
                 }
 
                 if (isset($app['security.context'])) {
-                    $twig->addExtension(new TwigSecurityExtension($app['security.context']));
+                    $twig->addExtension(new SecurityExtension($app['security.context']));
                 }
 
                 if (isset($app['form.factory'])) {
@@ -64,7 +64,7 @@ class TwigServiceProvider implements ServiceProviderInterface
                         $app['twig.form.templates'] = array('form_div_layout.html.twig');
                     }
 
-                    $twig->addExtension(new TwigFormExtension($app['form.csrf_provider'], $app['twig.form.templates']));
+                    $twig->addExtension(new FormExtension($app['form.csrf_provider'], $app['twig.form.templates']));
 
                     // add loader for Symfony built-in form templates
                     $reflected = new \ReflectionClass('Symfony\Bridge\Twig\Extension\FormExtension');