Changed isGameWon and scoreIsHighScore not to pass a boolean (it was
useless);
Added getscoreboard method
Changed addScore to return a boolean and started implementing openFile
method.
Added getScoreStack method
Started implementing saving and writing score files.
Merge remote-tracking branch 'origin/ui' into businesslogic

Conflicts:
	src/ca/csf/minesweeper/Minesweeper.java
	src/ca/csf/minesweeper/MinesweeperObserver.java

Merged ui
Removed boolean parameter for gameIsWon in controller