Merge branch '2.3' into 2.5

* 2.3:
  [2.3] More cs fixes
  Removed unused imports
  CS fixes
  bumped Symfony version to 2.3.24
  updated VERSION for 2.3.23
  update CONTRIBUTORS for 2.3.23
  updated CHANGELOG for 2.3.23

Conflicts:
	src/Symfony/Bundle/FrameworkBundle/EventListener/SessionListener.php
	src/Symfony/Bundle/SecurityBundle/DependencyInjection/MainConfiguration.php
	src/Symfony/Component/HttpKernel/Kernel.php
	src/Symfony/Component/HttpKernel/Tests/Bundle/BundleTest.php
	src/Symfony/Component/Routing/Matcher/Dumper/PhpMatcherDumper.php
Merge branch '2.5' into 2.6

* 2.5:
  CS fixes
  [2.3] More cs fixes
  Removed unused imports
  CS fixes
  bumped Symfony version to 2.5.9
  updated VERSION for 2.5.8
  update CONTRIBUTORS for 2.5.8
  updated CHANGELOG for 2.5.8
  bumped Symfony version to 2.3.24
  updated VERSION for 2.3.23
  update CONTRIBUTORS for 2.3.23
  updated CHANGELOG for 2.3.23

Conflicts:
	src/Symfony/Component/Console/Helper/ProgressBar.php
	src/Symfony/Component/Debug/ErrorHandler.php
	src/Symfony/Component/HttpKernel/Kernel.php
	src/Symfony/Component/Security/Http/HttpUtils.php
	src/Symfony/Component/Validator/Mapping/Factory/LazyLoadingMetadataFactory.php