Made the sprite shorter and skinnier

This actual helps with stairs!
Updated the README OK?
Added the collisionDirection function

It will axis align collision direction based on intersecting v with the
sides of the tile.
Merge branch 'input' into stop_wall_creep
Merge branch 'refactor_mapdata' into stop_wall_creep
Merge branch 'master' into stop_wall_creep
Merge pull request #17 from variousauthors/stop_wall_creep

I love sending myself pull requests.