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 

One thought: if you sorted by ("baseurl", "series", "-revision") then you wouldn't need the map when filtering - you could just exclude an entry if it had the same base URL and series as the previous entry.