Bricks added

Bricks are added, they have hitpoints and display differently based on
hitpoints

model quiries whether objects still exist and removes if they don't
Added a paddle
can now select Spheres, shift click/drag to make new ones
shift alt to make immovable ones
Merge branch 'master' of https://github.com/atklobas/BC_physics.git

Conflicts:
	src/controller/Tester.java
	src/view/Renderable.java