Added button for controlling display of surface normals

Control is in and functional. The normals are off though. Now that I
can see them, I’ll go fix the problems. :)
Attempting to clean up the surface normal code

Without much luck. Also added teapot.obj to the project and tested with
it.
More fun with surface normals
Clean up

Commented out the NSLog() calls in the parser to stop the logging spam.
#if 0 ‘d the test code in the app delegate since I have an instance of
the parser and mesh in the view (yes I know it violates the MVC pattern)