Wystia

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* WistiaHelper: Add method ``enable_captions_and_ad``
* Remove ``.format`` usage in log statements
* Remove an unnecessary method ``ad_needed`` from ``VideoData``
* Update readme and Sphinx ``docs/``

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* Fully implement all sections in the Wistia Data API
* Add more methods to the ``WistiaHelper`` class
* Request Count and API Token should now be globally shared by all API sub-classes
* Lot of code refactoring
* Exclude ``.mp4`` files from dist, to reduce total package size
* Add more test cases
* Update docs with better examples

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* First release on PyPI.