Python Super Stupid Space Invaders - 0.2

Wrote this to learn Python/PyGame, and now I think I know enough to be utterly dangerous with this language. ONWARD!!

Release notes for v0.2: - COLORS! Very VIOLENT colors!! - You can earn bonus ships now - Added more comments to the code, organized things a bit more - Meteor storms every other wave (experimenting with rotation) - Your shots collide with alien bombs - Two different types of alien bombs, fast and slow - Generalize keypress dispatch so canvases handle them.