Reintroduced url arguments in the urls for the tests.
Merge pull request #1463 from linovia/bugfix/old_request_factory_url_arguments

Reintroduced url arguments in the urls for the tests.
Serializer fields section for 3rd-party packages

* Add new section to serializer fields page where we can list and link 3rd-party packages that provide more field types
* Add an entry for drf-compound-fields
Merge pull request #1472 from estebistec/ref-compound-fields

Serializer fields section for 3rd-party packages
Tweak DRF compound fields docs
Minor docs tweak
authentication: allow all transport modes of access token in OAuth2Authentication

RFC6750 describe three transport modes for access tokens when accessing a
protected resource:
- Auhthorization header with the Bearer authentication type
- form-encoded body parameter
- URI query parameter

This patch add support for last two transport modes.
Update serializers.py

Prevent iterating over a string that is supposed to be an iterable <==> Prevent read_only_fields = ('some_string)
Update serializers.py

Prevent iterating over a string that is supposed to be an iterable <==> Prevent read_only_fields = ('some_string)
Update serializers.py
Merge pull request #1474 from elmehdikarami/master

Update serializers.py
Merge pull request #1469 from entrouvert/master

authentication: allow all transport modes of access token in OAuth2Authentication