removed defaults from PHPUnit configuration
[HttpFoundation] Remove content-related headers if content is empty
fixed CS
Merge branch '2.3' into 2.4

* 2.3:
  fixed CS
  [HttpFoundation] Remove content-related headers if content is empty
  removed defaults from PHPUnit configuration
added missing test
Merge branch '2.4' into 2.5

* 2.4:
  added missing test
  fixed CS
  [HttpFoundation] Remove content-related headers if content is empty
  bumped Symfony version to 2.4.8
  removed defaults from PHPUnit configuration

Conflicts:
	src/Symfony/Component/HttpKernel/Kernel.php