Django-rest-auth

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- Django 1.8 compatiblity fixes

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- fixed bug in PasswordResetConfirmation serializer (token field wasn't validated)
- fixed bug in Register view

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- support django-rest-framework v3.0

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- fixed few minor bugs

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- added old_password field in PasswordChangeSerializer
- make all endpoints browsable
- removed LoggedInRESTAPIView, LoggedOutRESTAPIView
- fixed minor bugs

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- replaced ``django-registration`` with ``django-allauth``
- moved registration logic to separated django application (``rest_auth.registration``)
- added serializers customization in django settings
- added social media authentication view
- changed request method from GET to POST in logout endpoint
- changed request method from POST to PUT/PATCH for user details edition
- changed password reset confim url - uid and token should be sent in POST
- increase test coverage
- made compatibile with django 1.7
- removed user profile support