Set up player and obstacle relationship
Added Playground class as container for obstacles.
Removed obstacles from controller
Merge origin/master
Added test to Strike class
First version of shooting physics added.
Merge commit 'fc78ca41cd991eca9efb5a356c438134d3b61169' into TUI-Output

Conflicts:
	Ballerburg/src/de/htwg/ballerburg/controller/BallerburgController.java