Fix signature of the UseControllerWork to respect last changes in WorkedInterface

PHP Fatal error:  Declaration of Symfony\Bundle\AsseticBundle\Factory\Worker\UseControllerWorker::process() must be compatible with Assetic\Factory\Worker\WorkerInterface::process(Assetic\Asset\AssetInterface $asset, Assetic\Factory\AssetFactory $factory)
Merge pull request #200 from benji07/patch-1

Fix signature of the UseControllerWork to respect WorkerInterface