There should be tests for the helper models but these are dumb.
Fix MongoBackend purge to use spec so we can remove all or particular ids. pep8 fixes.
Remove unused import in opencivic.
Remove pypy from envlist. Add pytest-cov so we get coverage reports.
Add test_openstates with a bunch of dubious tests.
Make openstates.bill_detail also accept an integer (in addition to str) for session.