Added Python versions of most of the C++ usage examples (except the GPU one, as the Processor.getGpuLut3D method isn't exposed). Might not be terribly practical code, but it's a nice demo of the Python bindings (plus not being hugely familiar with C++, I find it extremely useful seeing both side by side!)

Other commits relate the docs, mainly the setup page:

...and reorganise the headings for the above changes, to keep the ToC tidy (rST's heading notation is slightly.. odd)

Temporarily copied a built version of the updated docs to http://dl.dropbox.com/u/796113/ocio_docs_temp/index.html

Shall do the CLA tomorrow afternoon!

- Ben