With details of new prices/availability structure.

The docs on pitfalls with migrations and a custom user model are
not accurate anymore since migrations in Oscar have been fixed. Hence
this update them.

is_required and sequence_number are removed. That also makes the unused
get_prerequisites function obsolete.

Those fields were added with the idea that those event flows are linear,
but all implementations assume a non-linear pattern.

Add documentation and hide visibility from UI

Credit and thanks go to @seddonym (David Seddon).

Related to #823

We currently mention it in internals/sandbox.rst. I've added a note to
the dashboard app (ref/apps/dashboard.rst), the sandbox/urls.py and
expanded on the feature explanation on index.rst.

Fixes #816

They were missing the autodoc documentation for views (abstract) and
abstract models.
Also added two docstrings to the views in the promotions app to have
them showing in the autodoc.

Turns out Django>=1.4 does include staticfiles and messages in its
default INSTALLED_APPS.

Fixes #814

Some method defaults have been removed to make it more explicit when
things are loaded.

Also adds a docstring to the is_discountable AbstractProduct

Dependencies installed via setup.py stay in their eggs and their
templates won't be found by Django. This caused a
TemplateNotFoundError when users were trying to use
Django's admin to set categories.
Using the admin is unsupported, but this still prevents a similar error
from happening when we use other dependencies that ship templates. It
also shouldn't slow down production use.

Fixes #761

Source: https://groups.google.com/forum/#!msg/django-oscar/AbjNVCPnwIM/cWieN8AkwSIJ

Spotted here: https://groups.google.com/forum/#!msg/django-oscar/539hyvFPNso/6pXa-M3cfhEJ

# Last 5 commit messages
# ----------------------
# 30eead5 Remove custom user app from sandbox [Maik Hoepfel]
# ee3ee02 Drop create_migration.py helper [Maik Hoepfel]
# a77e78c Don't show country field if only one is available [David Winterbottom]
# b5790aa Handle products without a category in GA subission [David Winterbottom]
# 39e0932 Merge pull request #782 from tangentlabs/feature/add_eway_extension_to_docs [David Winterbottom]

- Presentations link
- Commercial support update

Faster is better!

* Use correct directives in signals.rst
* Removed newline in glossary.rst that broke sorting of glossary terms
* Removed syntax warning for upgrading.rst

All credit for those findings goes to Dawid Lorenz.

includes django.core.context_processors.tz.

Only search_default needed correcting.

When you use the notation with slashes, use full path to file.
With dots, enter module name. Commands run with the current test set.

- Add new block for payment tab
- Rename transactions block
- Provide transactions in get_context_data
- Better handling of empty iterables