Fixed a few light bugs
Explosions now draw on light layer
Particles no longer get added if offscreen
Merge branch 'soundhandler'
Merge branch 'master' of https://github.com/jhaslowh/CS426
Merge branch 'master' into soundhandler
chagne blaster sound for class presentation

the original sound is what we probalby are going to use, but since
the rest of the sounds are placeholder I'm holding off for now.