Re-registers unpublished/archived/deleted editions

Editions which have been archived or unpublished in Whitehall don't have
their state updated in Panopticon.

Story: https://www.pivotaltracker.com/story/show/69528904

This adds the "unpublish" and "archive" verbs to the Panopticon
Registrar service listener and sets the adequate state on the
RegisterableEdition object sent to Panopticon.

This solution also requires updating `edition_test#should_remove_published_edition_from_search_index`
since this now triggers an external request.
Fair enough. Might not be best to rely on jenkins keeping the old builds though. It does look like whitehall data migration builds are all kept on the new skyscape deploy machines, but other projects discard the old ones. I'd say it would be a good idea to get a copy after this is run for safety.