String translation added to game engine. Programmed by Michael.

The Game Engine can now translate Grid objects to string should the game
engine be outputting a generation to something other than the game engine.
(Feature #166)
Comment change. Programmed by Michael.
Merge branch 'feature/#166_grid_object_to_string_translation' of github.com:CO600GOL/Game_of_life into develop

Conflicts:
	GameEngine/game/game_controllers/game_controllers.py
	GameEngine/testing/test_game/test_game_controllers/test_game_controllers.py