A little formatting clean up
A little optimization on sending sprites to front/back, since it looks to be something done frequently in the update loop. It's not currently sending order changes down the wire, but is now ready to reject anything that won't result in a change.
Merge branch 'master' of https://github.com/Downstream/ds_cinder
Merge branch 'master' of https://github.com/Downstream/ds_cinder
A little code cleanup
Add framework for physics debug drawing. Note that no actual drawing is currently implemented (see project/physics/src/private/debug_draw.cpp for functions to implement). In order to turn on debug drawing, physics.xml needs this setting:
		<text  name="draw_debug" value="true" />
Merge branch 'master' of https://github.com/Downstream/ds_cinder