Merge pull request #1 from JoneWang/master

fix pop error and supported linux path
Updated some sprites, 2x size

Slowed animation. Overall game is 2x bigger.
Finished adding new sprites

Fixed map hitboxes, completed sprites.
New map, added map layers, updated readme

Made the readme suck less, actually added an example of linking between
maps (very temporary art), and layers to the map.
Merge pull request #1 from linkey11/master

Update