Display only the last revision of bundles in the bundles-containing endpoint.

This is now the default behavior.
Also update the revision-info endpoint.
Avoid using a map of previously included bundles in bundles-containing endpoint.
Merge pull request #233 from frankban/bundles-containing-last-revision

Display the last revision of bundles in bundles-containing.

Update the bundles-containing endpoint to only return the last revision of bundles by default.
Also update the revision-info endpoint to use the new denormalized fields.
This branch fixes #215
Added last ingestion times to debug/status output.