Add tests for wipe_id_fields_on_django_lt_17
Refactor wipe_id_fields_on_django_lt_17

* Replace filter and lambda with list comprehension
Add tests for Python2CountEqualMixin
Add a test for feincms_page.PageFactory
Refactor PageFactory

* Use class Meta instead of deprecated FACTORY_FOR
* Replace unnecessary lambdas with format
Add a test for factories.user.BaseUserFactory
Merge branch 'master' into even-more-tests
Merge pull request #28 from incuna/even-more-tests

Add tests for factories and compat