Add debugger.
Request reindex of editions when topics go live.

Sends reindex requests to Whitehall and Publisher
to request the async reindexing of tagged editions
when topics go live.

This prevents search getting out of date, which will
in future be handled by the content store pipeline.
Merge pull request #237 from alphagov/request-reindex-of-editions-when-topics-go-live

Request reindex of editions when topics go live