Game model

[ppeters0502]

I added the basic game model to models.py, and set up the host game button on the home page to check for an active game attached to the given player, and if there isn't an active game, it creates a new game model and saves it to the DB.
On the Game page, if you're hosting there's also an "end game" link, that if you click on it, sets the active flag to false (I'll work on the game deletion part later, this is just to test db functions).

closes #27

[abullockuno]

I was able to verify game code creation on host. Once a game was created, moving away from the site, logging out and back in, etc, did not change host game id. Deleting the hosted game allowed for the creation of a new game id upon clicking host again