Added Position class
bug fixing decrmementCritters on death and on end tile
Merge pull request #104 from sli-fox/jeremy

bug fixing decrmementCritters on death and on end tile
New CritterGameObject class that decouples Critter from GUI
Fully decoupled Critter class
Added class to decouple Tower from GUI
Merge pull request #105 from sli-fox/steph_branch

Steph branch
Added FreezeEffect