replaced deprecated Twig features
Merge branch '2.2' into 2.3

* 2.2:
  added missing support for the new output API in PHP 5.4+
  Fixed bug introduced in #8675
  made the filesystem loader compatible with Twig 2.0
  bumped Symfony version to 2.2.6
  updated VERSION for 2.2.5
  update CONTRIBUTORS for 2.2.5
  updated CHANGELOG for 2.2.5
  replaced deprecated Twig features

Conflicts:
	src/Symfony/Bridge/Twig/Extension/FormExtension.php
	src/Symfony/Bridge/Twig/Extension/RoutingExtension.php
	src/Symfony/Component/HttpKernel/Kernel.php