Tweaking Anim/Player classes

Resized the player, renamed the sprites for the anim class
Added gRenderEngine.getScreenPosition()

Previously I was building without a map or any reason for me to have both a screen position and a position within the canvas.
Switched XHR to sync  !!

This is a horrible idea.  I have to build the assetloader properly or the animations may not work since they rely on the JSON being loaded and I haven't made the xhr status stop the game from running until it's loaded so I just made it stop the whole page.  It works, right?  Bad, haha.