Added Racer to Game Center for integration
Sprites can be auto-generated, collisions work

Sprites have been reconfigured.
Here's the intended flow: To generate a fresh set of car sprites, simply
run the render.py (check file for usage). Then, use a program like
ImageMagick to autocrop (I used mogrify -trim +repage *.png). Then pack
the images together with TexturePacker. After this, convert the
outputted JSON using the JSON conversion script in the images directory.

I also added some basic error-checking on server.js so it doesn't crash
all the time, and when it does, it doesn't keep connections open. Should
add a constant polling if it is unable to establish a server connection.
Small positioning fixes
Adding AI to game (using player module system, WIP
Fixed AI

[humanPlayer is in transition. Next commit the player will be refactored
to use the same module system as AI)
tmp commit
Added start delay and results list

Game components need to be tuned, the results list might be converted to
DOM because it is so messy.
Code cleanup
Merge branch 'racer_singleplayer' into develop