[Serializer] fixed bc-break with cdata-section nodes
[serializer] fixed whitespace issue when decoding xml
Merge branch '2.5'

* 2.5: (25 commits)
  [Bridge][Twig] Replace deprecated features
  Yaml component change in 2.5
  [HttpFoundation] fix switch statement
  [serializer] fixed whitespace issue when decoding xml
  [Doctrine Bridge] fix DBAL session handler according to PdoSessionHandler
  #10862 loadClassMetadata vs loadValidatorMetadata: revert default config
  fixed previous merge
  Added phpdoc for Cache-Control directives methods
  [Console] OutputFormatter Unset Bold has wrong id
  [Debug] fix debug handlers config
  [Serializer] fixed bc-break with cdata-section nodes
  Remove undefined variable $e
  [Debug] fix wrong case mismatch exception
  bumped Symfony version to 2.5.1
  bumped Symfony version to 2.4.7
  bumped Symfony version to 2.3.17
  Fix a parameter name in a test
  updated VERSION for 2.5.0
  updated CHANGELOG for 2.5.0
  updated VERSION for 2.4.6
  ...

Conflicts:
	src/Symfony/Component/HttpFoundation/Session/Storage/Handler/PdoSessionHandler.php
	src/Symfony/Component/HttpFoundation/Tests/Session/Storage/Handler/PdoSessionHandlerTest.php
	src/Symfony/Component/HttpKernel/Kernel.php