This allows admins to:

* Preview emails in the dashboard
* Send preview emails
* Save emails

Fixes #359

Was an "image-not-found" image from another project, where I originally
harvested the testing images.

Also, sym-link in Oscar's image-not-found image to the assets/media
folder.

Fixes #343

* Add missing i18n tags
* Tidy pagination
* Minify CSS
* Remove dead HTMl
* Remove simple settings file

Closes #326

Includes:
* Reworked CSS
* New image field for product form

Reworking of #326

* They are now known as 'stock alerts' instead of notifications.
* They have been moved into the customer app largely (instead of their
  own one).
* The model implementation has been simplified.

Fixes #305

Remove old recreatedb script in favour of using the makefile.

* replaces all occurences of ``datetime.now()`` with
    ``django.utils.timezone.now()`` which returns aware or naive
    datetimes based on ``USE_TZ``
* increases ``South`` version to 0.7.6 in dependencies to make
    aware datetimes work in migrations.
* Oscar's sandbox is now configured to use aware timezones by
    default

Remove customisation which now lives in the 'demo' site.

Update makefile and docs to reflect this change.

Now using new *.oscarcommerce.com domains.

It only creates a payment event at the moment but it will do more.  Oh
yes.

Example sites now sit in their own folder (sites) for easier
organisation.