First Git Submission... Just Changed the bg images

Testing Github to see if what I do actually gets updated.
Updated Bg3 for level 3 with WIP Bg stuff.

Check it out. Lemme know what you think. It may be a little too light.
but its hard to tell at the moment .. will have to color mix a bit more
when I start making the floors happen. Pay attention to the style
mostly.
Merge branch 'master' into Brandon
Added toggleable grid and grid snapping. Still VERY WIP.