Add OAuth2 authentication for Django Rest Framework

Signed-off-by: Yohann D'ANELLO <ynerant@crans.org>

note_kfet/settings/base.py

@@ -239,6 +239,7 @@ REST_FRAMEWORK = {
     'DEFAULT_AUTHENTICATION_CLASSES': [
         'rest_framework.authentication.SessionAuthentication',
         'rest_framework.authentication.TokenAuthentication',
+        'oauth2_provider.contrib.rest_framework.OAuth2Authentication',
     ],
     'DEFAULT_PAGINATION_CLASS': 'rest_framework.pagination.PageNumberPagination',
     'PAGE_SIZE': 20,