Extend tox to support Oscar 0.6 and 0.7-dev
Update template comment around Oscar support
Fixing shipping API calls deprecated in Oscar 0.6
Bump to Oscar 0.6.3 in tox.ini
Include STATIC_ROOT for tests

It's needed by django-compressor==1.3
Remove purl from install_requires

Oscar>=0.6 already includes it.
Use correct tagline for sandbox

Plus remove static dirs.
Prettify the sandbox payment details template
Use timezones in sandbox
Upgrade dependencies in requirements.txt
Re-apply offers when loading frozen basket
Remove pinned versions of Oscar/Django from requirements.txt

This conflicts with Tox.
Bump version to 0.8
Merge remote-tracking branch 'upstream/master'