Merge branch '2.8'

* 2.8:
  fixes CS
  fixed CS
  [DependencyInjection] Add missing file headers
  fixed typo
  made Symfony compatible with both Twig 1.x and 2.x
  [FrameworkBundle] Fix precedence of xdebug.file_link_format

Handler/SwiftMailerHandler.php

@@ -45,7 +45,7 @@ public function onKernelTerminate(PostResponseEvent $event)
     }
 
     /**
-     * After the CLI application has been terminated we will always flush messages
+     * After the CLI application has been terminated we will always flush messages.
      *
      * @param ConsoleTerminateEvent $event
      */