Add postprocess to SplitScreen demo
Code cleanup + better demonstration of current issue with PostProcess shaders not working well with FlxCameras.
Making post process work on game level. Still broken...
Merge branch 'dev' into post-process-game
Merge pull request #107 from HaxeFlixel/dev

Merge with dev branch
Merge branch 'dev' into post-process-game
Merge branch 'post-process-game' of https://github.com/HaxeFlixel/flixel-demos into post-process-game
Switching to scanline shader.
Merge branch 'post-process-game' into dev

Conflicts:
	Flixel Features/SplitScreen/source/GameClass.hx
Add PostProcess demo