[Backport] Docs: Fix formatting of command line instructions

Sphinx turned the double dash into a long dash. A user reported issues
with running the command after copy&pasting it.

(cherry picked from commit 90ab1f19f061746cbe72c528b110a9bf62a71632)
Release notes: Fix indentation
Don't specify basket when calling build_submission

This allows subclasses to pass an alternative basket without having to
override get_context_data. If we don't explicitly pass a basket then
build_submission will default to using request.basket, which is the
normal behaviour.

I spotted this while extending django-oscar-paypal to support Oscar 0.7.
Bump version to 0.7.1 and update docs
Merge branch 'releases/0.7'

Conflicts:
	docs/source/releases/index.rst
	oscar/__init__.py
Merge branch 'master' of github.com:tangentlabs/django-oscar