This allows updating code in both places, if necessary. Getting Django
1.5 support would be painful otherwise. This also removes the circular
dependency of django-oscar-testsupport on Oscar.

The requirements were merged. The imports were updated
accordingly. Unused imports in the touched files were removed. No
further changes.

This is required to allow the pages component of the dashboard to
continue to work correctly.

Fixes #376

Also split them into unit and functional tests.