The OrderDiscount did not store (a copy) of the offer
name within a separate field which causes an issue when the
offer is deleted. E.g. it breaks the order history view for
the customer because no offer data is available.

I have added a new field to OrderDiscount that is automatically
populated from the offer.name field. This works in the same way
as voucher_code does in the same model.

I also found two issues with the voucher implementation within
the same model that are fixed now.

Fixes #330

* replaces all occurences of ``datetime.now()`` with
    ``django.utils.timezone.now()`` which returns aware or naive
    datetimes based on ``USE_TZ``
* increases ``South`` version to 0.7.6 in dependencies to make
    aware datetimes work in migrations.
* Oscar's sandbox is now configured to use aware timezones by
    default

Also split them into unit and functional tests.

This is probably a breaking change for most people as the migration
history for the order app has been rewritten.  It will take some
fiddling around with south to get your system back in order.

This change is required though as we need to break the links between the
apps.

These are a simple model that books into the post_save of a stockrecord.

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

help create orders for testing.

Split all the steps into separate methods.
Also finished removing all references to "delivery"

to the admin and model set-up.