* Add note about ``get_default_shipping_method`` shipping repository method to the documentation.
* Add note how to add custom node to the dashboard navigation with non-dashboard URLconf.

Django 1.9 introduced the AUTH_PASSWORD_VALIDATORS setting which allows for
more flexible password validation. Switch to using that when it is available,
with a fallback to Oscar's previous behaviour in Django 1.8 or when this
setting is empty.

This was removed from the parent class way back in Django 1.4, and was
not being used at all here. It existed only for backwards compatibility.

- Drop support for Django 1.9 (EOL)
- Drop support for Python 3.6 with Django 1.8 to 1.10

Load i18n context processor from django.template instead of django.core as fix for Django 1.10

Upon implementing previous commit, my changes weren't picked up because
Oscar served the SimpleAddToBasketForm. If a user wants to implement
changes in both forms (which is more likely than it is not), the
previous structure meant they had to be duplicated or mixed in. Now, for
most changes, SimpleAddToBasketForm can be ignored.

The templatetag was actually never used in Oscar. See
`django-rangepaginator` for an alternative.

Deprecated in 1.4

Since there is no demo or us site anymore we can simplify the structure
somewhat by moving the sandbox one directory up