Djoser

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* Fix vulnerability of user endpoints.
* Fix issue that appears on DRF 3.9+ on legacy `/me/` endpoint.

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* Fix issue with circular import

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* Split user serializers (thanks to joshua-s)
* Add Django 2.1 to tox.ini
* Update travis.yml

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* Refactor urls to use new RESTful ViewSets
* Retain old urls for compatibility
* Add Django 2.0 to tox.ini
* Add DRF 3.8 to tox.ini
* Drop Django 1.10 support
* Update requirements.txt
* Update travis.yml
* Update .gitignore

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* Add Steam config to testproject
* Add python egg data to .gitignore
* Update social auth serializer to use GET parameters instead of JSON data
* Update python-social-auth integration tests to use GET parameters
* Update social auth credentials in testproject to use environment variables by default

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* Add proper validation errors for OAuth state validation

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