Updates tests requirements.
Fixes bad upload_to path.
Adds url property as expected by rest-framework.
Avoids all() retrieval just in case.
Replaces rest-framework upload view with more understandable and explicit one.
Adds url field to item serializer.
Adds missing MEDIA settings.
Adds default rest-framework JSON renderer to settings.
Removes unused settings.
Updates tests requirements.
Adds url field in tests.
Updates upload tests.
Moves testapp tests with more real requests calls tests to webtest stopable server.
Adds url field in doc tests.
Adds upload tests.
Pep8 pass.