* It can now be specified in OSCAR_DASHBOARD_DEFAULT_ACCESS_FUNCTION
* nav.py and menu.py were split up so that Node can be dynamically
  loaded and hence overridden

I recently needed to alter the access function and realised it's not as
easy as I thought.

This required extending the offer factories to support setting the
start- and end-dates (looking forward to using FactoryBoy now).  Some
additional tests were added for the active manager.

Fixes #1128

The Contributor models (Contributor, ContributorRole, ProductContributor
and their abstract versions) were unused and too specific to the book
domain.

Product.status was provided as a convenience, but the real world showed
that more often than not, a different field type is necessary. As adding
a field is much easier than changing the field type, it is removed.

I tried to be conservative and mostly converted SlugFields that have
unique=True set.

For PaymentEventType and CommunicationEventType, it was discovered
that setting unique=True was likely forgotten.

As far as I could tell, no forms needed to be changed as they all
exclude the affected slug fields anyway.

This will allow saving two products with empty UPC outside of
ProductForm (which had special logic to support it).

Fixes #784

Django-haystack==2.0.0 breaks update_index.

Fixes #370.

The BooleanField is not used in Oscar core, and not commonly required.
The through-model ProductCategory is empty apart from the two
ForeignKeys, but left in place to allow customising.

Plus add some release notes.

It looks like 0.6 was missing some translation files due to a bug in the
Transifex client which was tricked by local timestamps and skipping some
translation files:
https://github.com/transifex/transifex-client/issues/22

We need to remember to use `tx pull -af` next time to force the download
of .po files.

This affected:

- Order history
- Reviews dashboard
- Wishlist detail

Fixes #1146
Related to #1121

Ticket #1127 correctly mentioned that we can't use Django's
get_user_model to register signals:
https://docs.djangoproject.com/en/1.6/topics/auth/customizing/#custom-users-and-signals

This commit rewrites the affected migrate_alerts_to_user receiver to
just happen in Oscar's AbstractUser save() method. This works upwards of
Django 1.4. For Django 1.4, a receiver must be manually registered to
the correct User model.

Oscar previously did neither do anything special for e.g. image
attributes or richtext attributes, nor provide hooks for doing so.

value_as_text and value_as_html properties have been introduced which
allow customising the output. Whereas the handling of the different
types is still lacking (e.g. the image type definitely needs special
handling), it is much easier to add support for that now. Adding them
has been pushed to a later date and is tracked in #1152.

Fixes #1149.

Without this, it still charges for items that don't require shipping.

Fixes #1138

This change ensures that the order model's FKs all use
on_delete=SET_NULL.

Cherry-picked (and adjusted) from 3e82571

Fixes #1130

It used to be a PositiveIntegerField containing the primary key of the
basket. This was a minor design deficiency; a nullable ForeignKey field
seems like the correct way to model that relation.
It's also been renamed from basket_id to basket to reflect the change.

Migrations unfortunately are non-trivial:
* 0019 adds the new ForeignKey field, but called basket_alt
* 0020 migrates data from the old field to the new field
* 0021 drops the now unnecessary field basket_id
* 0022 renames the basket_alt field to basket

The additional step with naming it basket_alt is necessary because of a
column name conflict. Django will pick a column name of 'basket_id' for
a ForeignKey field named 'basket', which is the same column name the
old PositiveIntegerField had.

Fixes #912

Plus ensure the copyright notice is correct for the modified phone
number work.

- Include screenshots.
- Expand sections up to deprecation.

Added to release notes & settings reference.

This reverts commit 7075ba6594.

It's not used anywhere in Oscar's code. It also doesn't feel right, as
adding categories via breadcrumbs is an undocumented hackish solution
anyway.

Two apps were forgotten. Also extended notes to mention new partner
dashboard.

This is to enable some coarse metrics of who is using Oscar.  We just
look at the referer header to get a rough idea of which sites are using
Oscar.

This is an important measure for Tangent, Oscar's sponsor.  It's
documented in the release notes and we'll make sure everyone knows when
Oscar is released.  It's easy to opt out of.

Fixes #656

Fixes #1021

Images are resized on the template level with Sorl, so having
those properties only leads to confusion. They were not used by stock
Oscar. Furthermore, thumbnail_url returned the full-size image URL,
which is wrong.

Fixes #1011