initial commit

Does this test pass?  Shouldn't this match the values set on `self.user` on line [178](https://github.com/cfpb/django-rest-framework-selectserializer/pull/1/files#diff-90df360ef442941f27066ecb2f3b9161R178)?

`{'username': 'ssmith', 'first_name': 'Sally', 'last_name': 'Smith'})`

Same goes for the next couple tests as well.