Drf-social-oauth2

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- Add general README info.
- JWT token provided through toggle.

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- Fix a bug where inactive users could still get tokens

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- Updated python-social-auth to social (`Migrating guide <https://github.com/omab/python-social-auth/blob/master/MIGRATING_TO_SOCIAL.md>`_)
- Wrapped token view and revoke token view in a rest framework APIView
- Added url namespace
- Renamed PROPRIETARY_BACKEND_NAME to DRFSO2_PROPRIETARY_BACKEND_NAME

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- Fix a bug where the hack to keep the django request was not working due to oauthlib encoding the object

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- Forgot to update django-oauth-toolkit version in setup.py (version 0.9.0 needed because of `this change <https://github.com/evonove/django-oauth-toolkit/commit/6bdee6d3a8c481dffaa68038cf3418b4f83c8f10>`_)

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- Convert token view api changed and is now more conform to the oauth2 api.
- Removed PROPRIETARY_BACKEND_NAME setting
- Invalidate sessions view now takes a client_id as a parameter