* feat :star: optimize range products reordering
* test :white_check_mark: add test to verify range product reordering
* fix :wrench: remove local settings from test settings
* test :white_check_mark: update product reordering test
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.