Use kwargs.pop in utils.test instead of kwargs.get.

`dict.pop` is similar to `dict.get` except it also removes the
element from the dictionary. This allows us to remove the sets
we were using to skip already-used arguments, since the arguments
are no longer there.
(#189) Add gender and title fields to primary/secondary contact information.
#167 Dummy view for importing committees and countries.
#167 Functionality for importing committees via the admin panel.
#167 Importing committees via admin panel.
#167 fixed functionality test.
#167 importing committee integration test.
#167 Integration test.
#167 Can import committees via admin panel and a working unit test.