initial commit
Fix up GameManager's singleton logic.
downsize mainmenu image
Random tweaks (mainly game speed so it is not hella fast)
use OpenGL to draw game instead of sprites. (genericize Food to Vector)

Food lost everything that made it not just a Vector, so I renamed it.
Remove unnecessary resources

these images are now rendered procedurally.
fix up GL rendering with Retina display

OpenGL takes pixels, not points - compensate.
I don't know if there's a better way to detect Retinability.
Remove commented code dealing with removed sprites
use logical (grid) coordinates instead of point coordinates.
fix stylistic consistency
new speed regulator + speed ramp

The new method stores the desired time (in seconds) between frames and uses deltaTime to track when that amount of time has passed.
move local variables out of class interface
bug fix: turning 180 degrees quickly (passing through an intermediate direction) kills you instantly.
improve touch handler

Be more lenient in accepting touches as direction commands.
remake Control.png from Control-hd.png
tone down speed ramp; move to GameplayLayer.m
change company name
Revamp rendering with caching and connected-snakiness

Move rendering functions into Render.m. Cache the background image and draw snake sections connected, and cache them as well.
change Retina rendering to use thicker lines
use properties for Vector class