Merge pull request #7 from Muelsby/master

rat bored animations
Fix sword collission bug
Cleanup to prepare move to screens
Let globals be globals
Move to GameScreen
Add sound and music example
Sound and music playing example
Merge pull request #8 from rnentjes/master

Some changes
Where are my walls?
My Sword!
Merge pull request #9 from rnentjes/master

Where are my walls?