Fix PEP8
Clean range ordering

- Remove forgotten print statement
- Rename `RangeOrdering` to more generic `RangeProduct` (later we can
  add another fields that are not ordering specific)
- Use `display_order` rather than priority (we set the order using
  jQuery sortable, not bump priority of couple products)
Fix backwards incompatible changes
Add 'Processed' as a final status in order status pipeline

Without this, it's not possible to search for processed orders from the dashboard, since the 'Processed' status doesn't come up as an option in the status select box.
Fix double </td> in order_report.html
Merge pull request #1024 from vdboor/bugfix/order_report

Fix double </td> in order_report.html
Update select2 to version 3.4.5
Adjust sandbox mod_wsgi config to use less resources
Add Solr config to sandbox
Remove MultiFacetedSearch{View,Form}

These classes have been removed in favour of the new search structure
developed for Oscar's demo site.
Use net_stock_level in search index
Rework faceting

The facets are now fully automatic based on the OSCAR_SEARCH_FACETS
setting.
Rename search form to be more generic
Update release notes with search changes
Ensure search results load products in bulk
Cache is_group per instance

This is a performance improvement as it prevents many SQL queries.  The
is_group property is called several times from within the templates and
this change avoids the dupliate queries.
Facet on product class and rating in sandbox
Fix typo

ProductReview model has property review*er*_name
Fix some typos in the documentation
Remove typos

Fixes #1021