Correcting coding style

I just launch the php-cs-fixer command on the src/core directory and it corrected a lot of things, not only coding style.

Let's see if the test is good, I have this error on my computer:
 > PHP Fatal error:  Cannot redeclare class Claroline\CoreBundle\Controller\AdministrationControllerTest in /home/maxime/workspace/Claroline/src/core/Claroline/CoreBundle/Tests/old/Controller/AdministrationControllerTest.php on line 506