check that get_neighbor_count gives you the output you want.
NOTE THAT I'VE CHANGE THE INDENTATION

BE AWARE.
minor changes

added temp variable to get_neighbor_count to clean up code.
x and y coords for add_creature are now defaulted to (0,0) and don't need to be specified.
play_game_of_life(max_size=6, num_iters=13, sleep_time=.3, is_test_run=True)
set_cell_to is now toggle_cell
Merge branch 'patch-2' of https://github.com/pizzaisdavid/Game_of_Life into pizzaisdavid-patch-2