Django-rest-auth

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- fixed package distribution issue

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- Compatibility fixes (437, 506)
- JWT auth cookie fix (345)
- config & packaging fixes
- updated docs
- added new translations (Czech, Chinese, Turkish, Korean)

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- added social connect views
- added check for pre-existing accounts in social login
- prevent double-validation in LoginSerializer
- unit tests and demo project changes for Django 2.0

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- added permission classes configuration for registration
- added more info to JWT docs
- added Polish translations

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- fixed import error when extending rest_auth serializers
- added sensitive fields decorator
- added Spanish translations

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- allowed using custom UserDetailsSerializer with JWTSerializer
- fixed error with logout on GET
- updated api endpoints and configuration docs
- bugfixes
- minor text fixes