* 2.3:
removed unneeded use statements
Prepend Child Bundle paths before the parent
[Routing] add unit tests for Symfony\Component\Routing\RequestContext class
Conflicts:
src/Symfony/Component/Form/Extension/Csrf/CsrfExtension.php
src/Symfony/Component/HttpKernel/DataCollector/TimeDataCollector.php
src/Symfony/Component/Validator/ConstraintValidatorFactory.php
* 2.2:
return 0 if there is no valid data
[Tests] Tests on php 5.5 should pass
[Twig] fixed TwigEngine::exists() method when a template contains a syntax error (closes#88546)