Created game module

Created a new python module to handle actual game play.

Right now, this module is just a stub which initializes itself and
has a run() method, but this should become more fleshed out soon.
Added game module support to main.py

Added initial game module suppory to the main.py by constructing a
game object to the project and then calling its run() method when
the 'Play' menu option is selected.
Updated .gitignore

Added *.pyc (compiled Python bytecode) to the list of files to be
ignored, as they are automatically regenerated at runtime.