interesting bug

water cells are supposed to be blue but don't show up. also it appears
that they are overlapping the food cells when they should be 10 spaces
away
bug fixed, water and food placed

food cells are green, water cells are blue, birds are black, infected
cells are red, infected birds are red. TODO 7/9/13: add logic for
infected bird and cell graphics, add directional bias and make
parameters file