Simplify product url tag

Consistently use product.get_absolute_url for product url, instead of 'category:detail' with kwargs
Fix for oscar_calculate_scores

Use double quotes(") instead of grave accents (`) to avoid DatabaseError while running 'python manage.py oscar_calculate_scores'
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
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
Fix typo and formatting

Fixes #1028
Added template blocks for easier customization