GUI: some controll

Now when you press a button that field changes to black. The gui
responds to it aswell
GUI: new looks

Changed from buttons to pebbles more representing the "real" game
GUI: cleanup

Some tidying up
Game: Set start conditions

Made so the game starts with the normal "cross" of 2 white and 2 black
Model: Clone

Made the clone method on the model to use when we calculate the tree.
Merge remote-tracking branch 'origin/model'
Fixat conflikter