edited typo in sandbox.rst
Tougher tests for category browsing

Verify that a correct URL leads to no redirect, and verify that an
incorrect URL leads to a redirect and the redirect has the correct URL.
New URL scheme for permanent category URLs

The old one was too identical to the product URL scheme and caused
issue #765. There really isn't a good way to keep them in the same
"namespace", hence all category browsing will happen under
/catalogue/category now.
Change data migration to act on frozen orm model instead of using call_command
Run tox tests in parallel with detox

Faster is better!
Docs: Correct a few minor mistakes
Suppress debug output of template timings debug toolbar panel
Add introspection rule for UppercaseCharField

This is necessary for South migrations. As it doesn't define any new
parameters, an empty ruleset is all that is needed.
Contextualize address title

A product's title is different from a person's title. Needed e.g. for
translating to Portuguese.

Fixes #667
Add missing migration for UppercaseCharField on AbstractAddress

I wasn't aware that this change requires a migration. But South reports
it, so let's keep South happy.