Some emails take a set of lines passed in explicitly.  This changes
helps test such situations.

For instance, if you need to adjust the HTML formatting of the
multi-widget.

When a non-existant field gets passed, the templatetag was raising an
unseemly AttributeError.  This change checks to see if the passed var is
actually a form field to avoid said error.

Unfortunately, abstract versions of addresses are located in the address
app, but then used in e.g. order/models.py. That's why I missed the
migration for this one.

Oh well, all good things come in three's!

I wasn't aware that this change requires a migration. But South reports
it, so let's keep South happy.

A product's title is different from a person's title. Needed e.g. for
translating to Portuguese.

Fixes #667

This is necessary for South migrations. As it doesn't define any new
parameters, an empty ruleset is all that is needed.

The old one was too identical to the product URL scheme and caused
issue #765. There really isn't a good way to keep them in the same
"namespace", hence all category browsing will happen under
/catalogue/category now.

Useful in templates where the bankcard form is rendered.  Eg:

    {{ bankcard_form.bankcard.obfuscated_number }}

Without it, Sphinx' autodoc for oscar.apps.dasboard.views would not
list the view nor it's members.

Using get_classes for models isn't the right way.

Plus reorganise tests

For consistency innit

This allows the form field template to be customised and re-used,
avoiding duplication.

Fixes #754

- Non-field errors render in separate alert blocks (including the
  exclamation icon)
- We also show a generic "there are errors" block at the top of an
  invalid form.

Validation is based on wikipedia list of postal codes [1]. Formats were
converted into regexes for countries.

1: http://en.wikipedia.org/wiki/List_of_postal_codes

Fixes #753

Fixes #745

Bad index in `last_line = covered_lines[-1][1]` (previously [-1][0])
caused rounding error. When you have 3 products for £7 and benefit 3
things per £20, each product would get discount £0.33 which doesn't sum
up to £1. The existing code handles this but bad indexing makes it fail.
A test case reproducing the issue was added.

Fixes #742

Only search_default needed correcting.

It's not really needed as it doesn't make sense to simply add an address
to your addressbook as part of checkout.

This change adds a uniqueness constraint on user addresses to prevent
duplicates.  A few changes follow:

- The user address forms in account and checkout are modified to take a
  user as a constructor arg so uniqueness can be checked.

- The assignment of a user when creating a new address has been moved
  into the form.

Previous version was not filtering by user.

It's possible that a user could select an address to ship to but then
delete it before checkout is complete.  This change raises an
UnableToPlaceOrder exception in such circumstances.

Also I moved the generate_hash fn up to the Address superclass as it's
possible that it might be used in other Address classes.

OrderPaymentMixin has a new method `get_shipping_address` which returns
shipping address without saving it. Useful as part of checkout process.

It makes it easy to mark a method deprecated and is easy to look up
deprecated methods via grep (look for '@deprecated').

Email address is more appropriate to display than Guest.

Fixes #740

Caused by reworking of the user creation form.

The message context includes the variable include_buttons, but the
template checks for presence of show_buttons. This led to the buttons
never being displayed.

- Expand width of address block
- Wrap edit user address form in "well"
- Add extra blocks to preview template, splitting out shipping address,
  contact number, notes and method.

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

Fixes #676

- No longer subclasses the auth view
- Uses a mixin for shared view functionality

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