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.

Fixes #376

Also split them into unit and functional tests.

I moved the ``OderSummaryView`` from the order section in the
dashboard to the main dashboard index and merged it with the
``IndexView``. I removed the summary template and merged the
relevant data into the dashboard template.

This allows the flow of statuses for an order to be controlled.