Add the math.h header
Add the math.h header

Fixes #51

seanmakesgames/mini_racer,seanmakesgames/mini_racer,discourse/mini_racer,seanmakesgames/mini_racer,seanmakesgames/mini_racer,discourse/mini_racer,seanmakesgames/mini_racer,n00bish/mini_racer,n00bish/mini_racer,n00bish/mini_racer,n00bish/mini_racer,discourse/mini_racer,discourse/mini_racer