Started doing some work towards being able to shoot astroids.
Added so that astroids can be hit, and so that they split when they are hit by a bullet. Also added a trail behind the spaceships.
Added a simple in game menu that can close the game
Merging a conflicting menu branch into the master branch
Merge branch 'menu'

Conflicts:
	src/spaceships/SpaceShips.java
Improved the graphics for trail debri