Merge branch '2.6' into 2.7

* 2.6:
  [2.6] Towards 100% HHVM compat
  [Security/Http] Fix test
  [Stopwatch] Fix test
  Minor fixes
  Towards 100% HHVM compat
  unify default AccessDeniedExeption message
  trigger event with right user (add test)
  [Security] Initialize SwitchUserEvent::targetUser on attemptExitUser
  [Form] Fixed: Data mappers always receive forms indexed by their names

Conflicts:
	src/Symfony/Bundle/FrameworkBundle/Controller/Controller.php
	src/Symfony/Component/VarDumper/Tests/CliDumperTest.php
	src/Symfony/Component/VarDumper/Tests/HtmlDumperTest.php

Author: nicolas-grekas

Tests/Fixtures/includes/ProjectWithXsdExtensionInPhar.phar

@@ -44,4 +44,4 @@ public function getAlias()
 </xsd:schema>
 EOT
 );
-$phar->setStub('<?php require_once "phar://ProjectWithXsdExtensionInPhar.phar/ProjectWithXsdExtensionInPhar.php"; __HALT_COMPILER(); ?>');
+$phar->setStub('<?php Phar::mapPhar("ProjectWithXsdExtensionInPhar.phar"); require_once "phar://ProjectWithXsdExtensionInPhar.phar/ProjectWithXsdExtensionInPhar.php"; __HALT_COMPILER(); ?>');