Lock buttons when game is finished
Minor modifications GameActivity.
Working Game with reference to GameActivity

Code has been modified  a lot in Game and GameActivity.
* Small bug: Board does not reset on the EndGameActivity, i’m not going
to fix it because we are going to get rid of this activity and use a
dialog instead.
Merge branch 'develop' into feature/design-refactoring

Conflicts:
	app/src/main/java/com/frisodenijs/tictactoe/Game/Game.java
Merge pull request #18 from KB50-G1/feature/design-refactoring

Feature/design refactoring