Merge branch '2.5'

* 2.5:
  added missing test
  fixed CS
  [HttpFoundation] Remove content-related headers if content is empty
  bumped Symfony version to 2.5.2
  bumped Symfony version to 2.4.8
  updated VERSION for 2.5.1
  updated CHANGELOG for 2.5.1
  removed defaults from PHPUnit configuration

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

Author: fabpot

phpunit.xml.dist

@@ -3,13 +3,7 @@
 <phpunit xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
          xsi:noNamespaceSchemaLocation="http://schema.phpunit.de/4.1/phpunit.xsd"
          backupGlobals="false"
-         backupStaticAttributes="false"
          colors="true"
-         convertErrorsToExceptions="true"
-         convertNoticesToExceptions="true"
-         convertWarningsToExceptions="true"
-         processIsolation="false"
-         stopOnFailure="false"
          bootstrap="vendor/autoload.php"
 >
     <testsuites>