Renamed onPlayerState function
Bullet and collision detection
Player collision works now. Gun damage is partially working.
Ugly POS comment
Add list of keyboard shortcuts for Love

Closes #77
Merge pull request #105 from alanjcfs/keyboard-shortcuts-in-readme

Add list of keyboard shortcuts for Love
Merge pull request #106 from gamelost/boundary-box

Boundary box
Set up a better coordinate system.
Add per-layer transforms.
Fix direction of bullets.
Text layer transform.
Fix clock issues.
New loading screen.
Bug fixes.
PG language.
Toggle layer transitions.