* 2.5:
[Process] Adjust PR #11264, make it Windows compatible and fix CS
[Process] Fix unit tests on Windows platform
bumped Symfony version to 2.5.3
bumped Symfony version to 2.4.9
bumped Symfony version to 2.3.19
updated VERSION for 2.5.2
updated CHANGELOG for 2.5.2
updated VERSION for 2.4.8
updated CHANGELOG for 2.4.8
[2.5][Form] solved dependency to ValidatorInterface, fix#11036
updated VERSION for 2.3.18
update CONTRIBUTORS for 2.3.18
updated CHANGELOG for 2.3.18
[Process] Use correct test for empty string in UnixPipes
Conflicts:
src/Symfony/Component/HttpKernel/Kernel.php
src/Symfony/Component/Process/ProcessPipes.php