Silence invasive deprecation warnings, opt-in for warnings

Author: reecefowell

Templating/Helper/LogoutUrlHelper.php

@@ -39,7 +39,7 @@ class LogoutUrlHelper extends Helper
     public function __construct($generator, UrlGeneratorInterface $router = null, TokenStorageInterface $tokenStorage = null)
     {
         if ($generator instanceof ContainerInterface) {
-            trigger_error('The '.__CLASS__.' constructor will require a LogoutUrlGenerator instead of a ContainerInterface instance in 3.0.', E_USER_DEPRECATED);
+            @trigger_error('The '.__CLASS__.' constructor will require a LogoutUrlGenerator instead of a ContainerInterface instance in 3.0.', E_USER_DEPRECATED);
 
             if ($generator->has('security.logout_url_generator')) {
                 $this->generator = $generator->get('security.logout_url_generator');

Twig/Extension/LogoutUrlExtension.php

@@ -11,7 +11,7 @@
 
 namespace Symfony\Bundle\SecurityBundle\Twig\Extension;
 
-trigger_error('The '.__NAMESPACE__.'\LogoutUrlExtension class is deprecated since version 2.7 and will be removed in 3.0. Use Symfony\Bridge\Twig\Extension\LogoutUrlExtension instead.', E_USER_DEPRECATED);
+@trigger_error('The '.__NAMESPACE__.'\LogoutUrlExtension class is deprecated since version 2.7 and will be removed in 3.0. Use Symfony\Bridge\Twig\Extension\LogoutUrlExtension instead.', E_USER_DEPRECATED);
 
 use Symfony\Bundle\SecurityBundle\Templating\Helper\LogoutUrlHelper;