Added elevation support for the tiles.  Text can now be drawn with an outline. Ripped out openGL ES 1.1 support. Drawables support general purpose shaders better and merge into big drawables more easily. Pinch delegate zooms around center of pinch.
Copyright date update.
Removed DrawCost.  Modernized the Obj-C a bit.  Cleaned up a bit of documentation.  Exposed simultaneous loads in a few places.  SimpleIdentity is now 64 bit.