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.

It's a nice app to handle non-blocking email sending.

In our instructions, it wasn't entirely clear that virtualenvwrapper is
required for setup.

Fixes #1088

nose-django-querycount gives individual and total query counts. This is
helpful to double-check changes that claim to affect query count
(e.g. #1056).
Total query count gives a quick overview, and diff'ing the output for
two different branches works well.

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 #1028

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

Two links needed to be corrected.

Done as it became apparent in #968 that further clarification is needed.

This setting never did anything. Added documentation for it being
dropped.

Fixes #983

The customisation section required some changes as it's not often
necessary to override the root application instance to change URLs or
views of subapps.

Those documents lived in ref/, but really aren't reference documents.
Topics/ is a more appropriate place for them.

Previously, only calling "make clean && make html" would display all
errors and warnings in the docs. This was too slow to do by default, and
hence many errors would go unnoticed.
Adding the -a flag to Sphinx forces it to look at all the files again,
but is considerably quicker than deleting the build directory. As such,
I think it's good default behaviour as it isn't too slow even on
non-SSD machines.

bootstrap-wysihtml5 was too buggy.  I was trying to avoid TinyMCE but it ended up
being the easier to use.  I tried with CKEditor but it proved too
difficult to configure.

Fixes #757
Fixes #946
Fixes #945
Fixes #944

Previous names were ambiguous as to whether discounts were being
included or excluded.

This involves some quite involved changes to the internals of how offers
and organised.  A new boolean field has been added to the offer model to
indicate whether to apply to prices exclusive of tax.  This is used
within the offer methods to determine whether a basket meets a
condition, and how to apply the benefit if it does.

Fixes #925
Fixes #924

The old Repository class wasn't thread safe as the method instances were
created at compile time.  Since the instance is configured by setting
the basket for each request, this poses thread safety issues as two
requests could share the same method instance (one of which would have
the wrong basket assigned).

This change fiddles with how the methods are handled, ensuring that they
are instanciated within the instance methods so that thread-safety
issues go away.

Shipping methods need a gentle rewrite for v0.7 to ensure they aren't
vulnerable to such issues.

 - make sure all pages are linked from somewhere
 - prohibit double indexing of source code modules
 - remove old unused offers (we use GIT, no need to keep old files)
 - use local version of Oscar logo

Fixes #921

If using autodoc to document Oscar app's models, one needs to add
:noindex: so Sphinx knows which page has the canonical model
documentation.