Update reference for django-storages.
Review Request #2013 — Created Dec. 24, 2010 and submitted
Update reference for django-storages. It seems like django-storages fixed the path of their modules, moving 'backends.s3' into 'storages.backends.s3'. This updates the references to it so we can use it again. This also fixes the storage settings form to call SiteSettingsForm.load() from load(), which makes it so the settings form displays the right thing when the backend isn't "builtin"