Sounds, and finally a leafboy's musical theme!

CHANGES:
- Added music, made by me in 30 minutes, using chiptune VSTs from http://www.tweakbench.com/
- Added free sounds taken from http://www.freesound.org/
- Added WASD control scheme
- Added another level



NEXT STEP:
- Finding why does the sound effects have SO MUCH LAG. ):<
- Still not animation, I'm not gonna animate leafboy... we'll see whats next.
- More levels, obviously