Stop the API Client converting empty lists/dicts to empty strings

Try running Tox from Travis

Better mapping for custom model fields to serializer fields.

Support RFC6266 encoded filenames

Supported translated text view descriptions

 This filename described in RFC 6266

Preserve default ordering when using filtering

Fix returning None when allow_none is True in CharField

Display validation errors on login form

Hide login link in browsable API if the login view is not registered.

Using user.get_username() instead of user.username.