zombies no longer run from each other and humans run from zombies even while clustering
Merge branch 'master' of https://github.com/ianaroot/game_of_afterlife into adjust-movement-incentives
fix wrapping
zombies repel each other within certain range
Merge pull request #14 from ianaroot/adjust-movement-incentives

zombies no longer run from each other and humans run from zombies even w...