Added HitAnimationComponent and -System.
If that component is added to a renderable entity, it will flash red for
the given duration.
Merge branch 'master' of https://github.com/Lusito/GameDevWeek.git

Conflicts:
	gdx-kitten-rescue/src/main/java/de/hochschuletrier/gdw/ss14/ecs/systems/RenderSystem.java
	gdx-kitten-rescue/src/main/java/de/hochschuletrier/gdw/ss14/game/Game.java