"Finished" excercise 1 BUT

Broke all Mockito related tests, the other tests work. No idea why. (Unfinished Stub...)

The game is "okay" but it does not make THAT much fun because there is no limit how often someone can open/close a door. No matter what it should run. There is a lot of log.debug(...) information at the moment and i had to hotfix a synchronized block because on levelchanges the client wasnt thread safe (and actually isnt)