Caused by reworking of the user creation form.

I used the existing script [1] that cooperates very nicely with vim.
1: https://github.com/rory/django-template-i18n-lint

Fixes #676

- Use a FormView (as it is a form view)
- Move the redirect URL validation into the form

The backported version didn't explicitly create the ProductAttribute
instances before assigning and so they didn't save.

If parent is given, only parent descendant categories will be returned.

Fixes #741

- Add more links
- Add event details to line detail page

Fields now more self-contained, the bankcard form is much simpler.

This makes creating simple shipping repositories simpler as you only
need to override the methods attribute.

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.

* Emailbackend: Updated to use REQUIRED_FIELDS
* Demo and sandbox site now use compat.AUTH_USER_MODEL as well
* Added example custom user that gets tested for Django >= 1.5

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

* Tidy implementation of validator
* Tests improved and moved to tests/integration (as they call resolve
  internally)

Change to required address fields was causing the shipping address step
to fail.

When adding to the basket, products with options were treated as
different products for each combination of options. This allowed adding
more products into the basket than are available for purchase.

The handling has been updated to sum up the already added quantity of
the product regardless of options.

Fixes #665

This is required for multiprocess testing to work (eg ./runtests.py
--processes=2)

Fixes #614

As they save stuff...

We now check in the OrderCreator for this attribute and only allocate if
it is true.

Fixes #671

Without a value, applying an AbsoluteBenefit raises a TypeError.

Fixes #670

This change introduces a templatetag which assigns context for adding a
'back to search results' link to a product detail page.  This can be
useful for certain types of user (who don't use the back button) and
want to get back to their, possibly complicated, set of search filters.

Fixes #456

The auth backend now gracefully handles situations where there are users
with the same email address.

Introduced in 7fd62f2af0.

The clean method was raising a KeyError when the date fields were empty.

The profile test can_change_password checked if the password change
form can be submitted succesfully, but did not verify that Django's
authentication system accepts the new password.

Product updates in the dashboard weren't being saved. This was a
regression introduced by my refactoring of the ProductUpdate/Create
views.

A test to ensure that a product title does indeed get updated has been
added.

Reported and fix supplied by @soloweb in #613. Thank you.

OSCAR_REQUIRED_ADDRESS_FIELDS allows setting which fields are required.
The use case is that post codes are expected to be required, but many
countries don't actually use them.