partial commit of risk calc
Merge branch 'master' of https://github.com/bvanvugt/planes-on-a-snake

Conflicts:
	risk.py
quadrant based risk calculation for snakes
Merge branch 'master' of https://github.com/bvanvugt/planes-on-a-snake

Conflicts:
	risk.py
Merge branch 'master' of https://github.com/bvanvugt/planes-on-a-snake