Fix several issues for Django 1.6
Adjust version dependencies for Django 1.6
Disable template timings toolbar panel
Add migration for NullBoolean field
Offer wizard works with JSON session serializer
Fix ordering of conditional offers

Offers by default are sorted using Meta class ordering. However,
`get_offers` was doing two queries and combining them together.
Effecitvely bypass the ordering.

Test for ordering basket offers was written in the process not being
aware of standard ordering. I left it there as it can be useful test in
future (when somebody removes standard ordering).

Fixes #964
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 reordering products inside ranges
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