Revert "[TASK] Downgrade to PHPUnit 3.7.*"

We can revert this again as the issue has been resolved
upstream: 
https://github.com/sebastianbergmann/phpunit-mock-objects/issues/172

We can now switch back to phpunit 4.1.* again.

This reverts commit 7a876ddcfc3d41521b39c073519bad286143508d

Change-Id: If08d3e7200103e5cab77fdc1e098efd2048bde4c
Reviewed-on: https://review.typo3.org/30623
Reviewed-by: Helmut Hummel
Tested-by: Helmut Hummel