Review: Fixed const correctness


Jeremy Selan <jeremy...@...>
 

Issue:
http://github.com/imageworks/OpenColorIO/issues#issue/48

Commit:
http://github.com/jeremyselan/OpenColorIO/commit/a0fb960d0e8b083acc4bd18048d24ac8e49f99ad

All the classes that relied on the m_impl pattern were inadvertently
working around const correctness. This fixes the issue.

-- Jeremy

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