Apply normal facing hack from segment atlas to spine test method

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What is the expected output? What do you see instead?

Sometimes sketchup models have flipped normals. The segment atlas code 
flips them back before loading into FBO. Maybe we should do the same with 
the spine test code somehow (though not clear how to do this).

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Original issue reported on code.google.com by forrester.cole@gmail.com on 23 Feb 2009 at 8:20

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However, I've noticed that the segment atlas hack also causes some errors with 
the 
profiles on the hull of the galleon. Maybe we need a better solution.

Original comment by forrester.cole@gmail.com on 23 Feb 2009 at 8:22