[Yaml] refactoring of merges for performance
[Yaml] fix priority of sequence merges according to spec

fixes symfony/symfony#11154
[Yaml] fix overwriting of keys after merged map

fixes symfony/symfony#11142
Merge branch '2.5'

* 2.5:
  fixed previous merge
  Added missing `break` statement
  don't disable constructor calls to mockups of classes that extend internal PHP classes
  Small comment update according to PSR-2
  [Yaml] fix overwriting of keys after merged map
  [Yaml] fix priority of sequence merges according to spec
  [Console] Fixed notice in QuestionHelper
  [Console] Fixed notice in DialogHelper
  [Yaml] refactoring of merges for performance
  [Console] remove weird use statement
  [HttpFoundation] Fixed Request::getPort returns incorrect value under IPv6
  [Filesystem] Fix test suite on OSX
  [FrameworkBundle] Redirect server output to /dev/null in case no verbosity is needed
  Add framework-bundle

Conflicts:
	src/Symfony/Component/Yaml/Parser.php