Minor Update to the Credits Screen

I modified the credits screen quite a bit. I left the dancing zombies in, but I made them much, much better. I also added some post apocalyptic ambience to the scene.

The dances include the Running Man, some Swing and Salsa, a twerky one, and other random modern dances. I grabbed them off Mixamo. If you're a developer and you're unfamiliar with mixamo, I suggest you familiarize yourself with it, sooner rather than later. That thing is awesome.

Anyway - I hope you like the credits and the new cover image. I know there are about 20 zillion zombie games in here, but I hope my credits screen makes me stand out.

Like that's gonna happen!