Aggiunta del bottone per la visualizzazione delle statistiche.
Modifica interfaccia grafica.
First statgui commit
Merge pull request #10 from BOFH873/Annalisa

Annalisa
Merge commit 'e10a2bad3647b355d1126b8216c91bc22e70eaf3'

Conflicts:
	src/game2048/GameManager.java
Merge commit 'e10a2bad3647b355d1126b8216c91bc22e70eaf3'

Conflicts:
	src/game2048/GameManager.java
Merge master into ilmiobrancio