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

Please note that ExtendedURLFields's verify_exist does not
default to True anymore.

Thanks to m@maikhoepfel.de who submitted this patch via the mailing
list.

Using the newly introduced feature hiding functionality, the reviews app
can now be hidden.

Introduces the concept of a "feature" that can be hidden. A list of
features to hide can be supplied in OSCAR_HIDDEN_FEATURES.

Feature hiding is currently supported in two places.
Application instances can carry a "hidable_feature_name". If set and
found in OSCAR_HIDDEN_FEATURES, post_process_urls will return an empty
set of url patterns, hence disabling relevant views.
display_tags also has a new template block tag iffeature.
{% iffeature "feature" %}xxx{% endiffeature %} will hide everything
inside the block if the feature is hidden.

This commit provides two mechanisms for passing format information from
Django to JS.

1. An options object can be passed to the oscar.dashboard.init method
   that provides default values for the formats.  This is optional - the JS
   itself has some hard-coded defaults.

2. Form elements can defined data attributes that specify format
   information directly.  This is implemented for the datetime inputs
   within the offers dashboard.

The "Browse categories" section was limited to two levels of
inheritance. Fixing this and keeping the iterative nature of the
template tag required rewriting it, borrowing heavily from treebeards
get_annotated_list method.

Fixes #672

Default value for HTTP_REFERER in BulkEditMixin

This fixes an issue where the admin would render HTML within the list
display (#705).

Also fixes #715

Fixes #719

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

Fixes #713

Some of them are rather basic, but it's a start.

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

When the LESS files are served but compression is disabled, the relative
URL between the generated CSS and other assets is wrong (using the
default compressor settings).  This fixes changes the output directory
name to match the path of Oscar's assets, which fixes this issue.

Related to https://github.com/jezdez/django_compressor/issues/226

Fixes #649

So that it's possible to use a different URL for static assets.

Since variables were required to be passed in, this forced evaluation of
the i18n string which caused a circular reference when Django started
up.

This isn't a permanent solution - just a workaround until search gets
the a reworking.

Use blank instead of null.

Without this, South was choking as it couldn't find a 'default' key in
DATABASES.

They were copies of an old Django 1.3 project version with some Tangent
extensions.

Fixes #709

This is useful for git shortlog - see:
http://simonharrer.wordpress.com/tag/git-shortlog/

Using *secret" formula for who's a contributor

They weren't using dicts for parameters to work around the ordering
issue.

Fixes #707

Avoids a key error when a referer is not available.

Also removed BulkEditMixin from the PartnerListView as it was not used.

Fixes #700

Fixes #697

Not the first time I've made this error.  Need to be more vigilant.

Thanks @raimonesteve for spotting.

Fixes #701

Promotions were omitted from the main layout block (accidentally I
imagine).  I think they used to be there - perhaps a template refactor
stripped them out.

This commit reinstates them so pages that use the default layout
template (like flatpages) can have promotions added to them.

Thanks @fatiherikli