* Added new authentication class(meets drf standards)
The new class replaces the deprecated oauth2authetnication class from rest_framework_auth library(repo django-rest-framework-oauth).
Majority of the code is combination of copy-pasta from old oauth2authentication class and Oauth2AuthenticationAllowInactiveUser class
* Added ability to switch to new authentication class in bookmarks app
* Changed error type reported by Outh class. It now outputs a json rather than a string.
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