Merge branch 'pr19'

Add keys to readme only, lack of room on GUI.

show help for keys G and H

Version 3.0.5 - 20 fps

Decrease fps to 20 while in bot mode.

Version 3.0.4 - Smooth circle, direction detection.

Merge pull request #16 from khumarahn/_yyy

Version 3.0.3 - raf

Use raf when available and bot is disabled.

Version 3.0.2

Reset currentFood if not growing.

circle method: determine direction automatically

off by one bugfix & clockwise rotation (!)

circle method: smoothing & better expansion

Version 3.0.1 - 'G' toggle graphics.