Lots of refactoring. The code is great, just re-organizing it as everything is starting to take shape.
Fixed performance issues (images were being reloaded every frame).
Fixed tile images (no more borders on IE/FF). Redid character sprite to get rid of anti-aliasing. Small refactor so that enemy id is consistant with other ids. Removed polyfill (facepalm) because Canvas is only supported in IE9+ anyways (duh).