Cleanup.
Auto select based on pixelScreenCoordScale.  Cleanup.  License.
Project file updates.
Merge pull request #3 from bakercp/retina

Retina update.
Update README.md
Update README.md
Retina fix working now.

I had to enable NSHighResolutionCapable in Info.plist.
http://forum.openframeworks.cc/t/retina-detection-backingscalefactor/13087/3

Probably it is ok to keep it enabled even if you don't have retina display. but please double check