Remove pesky \xc2 char from comment string
Update 0.8 release notes re shipping method changes
Repository methods must now be instantiated

This (possible backwards incompatible) change means subclassing and
customising shipping methods becomes much easier. Now that shipping
methods are stateless, we can instantiate at compile time and assign
them to the repository instance.

This commit also renames internal methods of the shipping repository
in as the 'prime' notion is no longer valid (as we're not injecting a
basket into each method).
Disable default use of spec plugin

I think it's better to default to faster settings. Spec-style output can
be enabled by passing --with-specplugin if need be.
Consolidate shipping docs

The howto recipe on shipping has been rewritten to describe the new
changes to shipping functionality. The old shipping app reference has
been merged in too to avoid duplication.