Highlight use of permissions alnog with authentication
Add `Unauthenticated` exception.
Add docs for 401 vs 403 responses
Use correct status code
Use correct status code
Use two seperate exceptions - `AuthenticationFailed`, and `NotAuthenticated`

Cleaner seperation of exception and resulting HTTP response.
Should result in more obvious error messages.
Merge with master
Remove OAuth2 from docs
Implementing 401 vs 403 responses
Merged to latest master
Update docs/api-guide/authentication.md

Added mod_wsgi specific instructions
Update docs/api-guide/authentication.md

refined mod_wsgi
Add nested create for 1to1 reverse relationships
Remove commented out debug code
Update one-to-one test names
Update errant test comment
Add one-to-one nested update and delete functionality
Move nested serializer logic into .field_from_native()
Use None to delete nested object as opposed to _delete flag
Kick travis into action