Displays the score in the screen

Score is also updated on hit, not destroy
Merge branch 'feature-scoring' into develop

Conflicts:
	bin/Galaga/Enemy.class
	bin/Galaga/Galaga$Return.class
	bin/Galaga/Galaga.class
More class commits
MORE CLASSES
Merge pull request #21 from cdglasz/develop

Develop Try #2