Merge pull request #61 from MalphasWats/master

Implemented A* pathfinding on TileMap, example included
Merge pull request #62 from MalphasWats/master

Tests for TileMap.findPath() added, inverted feature added and a bit of tweaking
tweaks/docs
fixes
build
README clarifications and typofixes
add Math.floor to centerAround to stop 'drifting' and odd gfx effects in non-chrome browsers
build
fix formatting/tabs
remove confusing parameter y to parallax-layer creations