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
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
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.
Use correct var for displaying transactions in dashboard order detail
PBD: Enforce one stock record matching users partners
Pass user into StockRecordForm

This would be necessary if one wishes to limit the partner selection
available in the product dashboard. As that might be a common
requirement, we just pass it along.
Pre-select partner if appropriate

If the user is not a staff user and has only one partner associated, we
pre-select that.
Extract setting initial data into own function

That makes it possible to override.
Merge pull request #1002 from tangentlabs/issue/1002/pbd_stockrecords

Improved stock record handling for permission-based dashboard
Merge pull request #1041 from LUKKIEN/bugfixes

Correct template variable for payment transactions in the dashboard order detail page
Add oscar-sagepay as community extension