Python-workfront

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- Narrative usage documentation added.

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- Add Quickstart and API documentation.

- Add actions to the reflected object model.

- Add a caching later to ``workfront.generate`` for faster repeated generation
of the reflected object model.

- Simplify the package and module structure of the reflected object model.

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- Fix brown bag release that had import errors and didn't work under Python 3
at all!

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- Python 3 support added.

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- Python 2 only release to PyPI.

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- Re-work of object model to support multiple API versions

- Full test coverage.