convert .obj to format able to be imported and used by iOS GlGravity

Convert .obj file and import it into glgravity demo code so it replaces the teapot. We want the object (a horse) to replace the teapot in the code. Two milestones: 1. clarification of deliverables (we will send .obj file to you) 2. Delivery of glgravity code with .obj embedded 3. Acceptance of glgravity modification