Cloudstorage

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* Update rackspacesdk to 0.7.5 and fix broken API calls (`14 <https://github.com/scottwernervt/cloudstorage/issues/14>`_).

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* Implement Microsoft Azure Storage driver (`1 <https://github.com/scottwernervt/cloudstorage/issues/1>`_).
* Google upload_blob is failing for binary stream (`7 <https://github.com/scottwernervt/cloudstorage/issues/7>`_ and `8 <https://github.com/scottwernervt/cloudstorage/issues/8>`_).
* Fixed type annotations using mypy.
* Formatted code using flake8 recommendations.

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* Fixes `6 <https://github.com/scottwernervt/cloudstorage/issues/6>`_: Add kwargs to each driver's init method.

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* Add pip cache to travis yml file to speed up tests.
* Set wheel python-tag to py3 only
* Set tox to pass all env variables to py.test
* Add travis repo encrypted env variables for running tests.

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* First release.