Merge branch '2.7' into 2.8

* 2.7:
  add @event annotation for AuthenticationEvents
  add @event annotation for KernelEvents
  bumped Symfony version to 2.7.13
  updated VERSION for 2.7.12
  update CONTRIBUTORS for 2.7.12
  updated CHANGELOG for 2.7.12
  bumped Symfony version to 2.3.41
  updated VERSION for 2.3.40
  update CONTRIBUTORS for 2.3.40
  updated CHANGELOG for 2.3.40
  Revert "minor #18257 [Routing] Don't needlessly execute strtr's as they are fairly expensive (arjenm)"
  Revert "fixed CS"
  [FrameworkBundle] Remove misleading comment
  bug #17460 [DI] fix ambiguous services schema

Author: fabpot

Core/AuthenticationEvents.php

@@ -20,6 +20,8 @@ final class AuthenticationEvents
      * The event listener method receives a
      * Symfony\Component\Security\Core\Event\AuthenticationEvent instance.
      *
+     * @Event
+     *
      * @var string
      */
     const AUTHENTICATION_SUCCESS = 'security.authentication.success';
@@ -32,6 +34,8 @@ final class AuthenticationEvents
      * Symfony\Component\Security\Core\Event\AuthenticationFailureEvent
      * instance.
      *
+     * @Event
+     *
      * @var string
      */
     const AUTHENTICATION_FAILURE = 'security.authentication.failure';