private'ing up Game and testing out branching in git

maximumNumberOfPlayers() now no longer static and is declared in Game.
This could be a bad design decision, but it lets us put all the getters
and setters that use it in the parent class (Game).
The getters and board's setter may need to be changed, very simple atm.
Merge remote-tracking branch 'origin/making-game-vars-private'