All ajax calls now append the edition as a parameter.

This starts us moving off of the domain as the edition.
Merge branch 'master' of github.com:guardian/frontend into single-domain
JS hint will not accept those missing semi-colons...
A bit more test coverage to edition param + some changes from pull request comments.
A bit more test coverage to edition param + some changes from pull request comments.
Merge pull request #761 from guardian/single-domain

All ajax calls now append the edition as a parameter.