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.
Update select2 to version 3.4.5
Create a new stacking context for the freakishly large z-index values used in upload-images

Without this, the image form is drawn over a datetimepicker that pops up so
that it overlaps the image form.
Added template blocks for easier customization
Minor PBD fixes

* Demo site now included link to dashboard when user has
  dashboard_access permission
* Correct permissions are set for new AJAX product lookup view
Use {% static %} for all images

Missed two instances.
Merge pull request #1031 from mbertheau/dashboard-users-template-blocks

Added template blocks for easier customization
Merge pull request #1023 from nitishr/patch-4

Add 'Processed' as a final status in order status pipeline