Rename feature file to be more generic
Failing feature for cancelling stats announcement
Add model/interface for cancelling announcements

Inlining styles straight from fofr's mockups for now. Will rationalise
the CSS in a later commit.
Remove delete from stats announcements

Users should not be able to delete an announcement once it's been
created as we do not want to lose the permenant record of an
announcement. Instead, announcements that are no longer valid should be
cancelled.
Restrict actions on cancelled announcements

You should not be able to cancel or change the release date on a
cancelled statistics announcement.
Allow editing of the cancellation reason
Strike-through cancelled release date
Update stats announcements with cancellation info
Add #state and cancel info to stats announcements

A StatisticsAnnouncement can now be in three states: "provisional";
"confirmed"; or "cancelled". This adds a new "state" method to the model
and makes sure this is propagated to the front-end models via Rummager
and StatisticsAnnouncementProvider. It also adds the "cancellation_date"
and "cancellation_reason" details to the front-end models.
adjust how state is displayed on front-end

As-per Guy's designs, we no longer include "(confirmed)" on confirmed
announcements and mark cancelled announcements as such on the main
stats announcements index page.
Show cancellation status on announcement page

Small issue with the alignment of the meta data for cancelled
announcements to deal with.
Correct typos
Styling tweaks for cancelling
Rake task to index upcoming stats announcements

This should be run straight after the deployment of the cancelling
statistics announcements feature to update all search index entries
to include the "statistics_announcement_state" field.
Inline form and filter results

There is no advantage to having these in separate partials now that the
filter results are not updated with AJAX.
Highlight cancelled announcements on index
More margin for "cancelled" alert
Fix inaccurate cancellation copy

* Copy was outdated prototype version, update to latest version
* Cancelled announcements remain on GOV.UK
* Reduce margin on paragraph to match padding on actions container
Reinstate "(confirmed)" on stats announcements

We need to check with ONS before removing the "(confirmed)" label, so
reinstating it for now.
Get rid of an inline style

Use the <del> tag instead as it seems semantically appropriate.