[Catalog-sig] API search by python version (or classifier)

["Martin v. Löwis"]

> Minor nitpick: You should remove all implementation specific things
> from that future PEP, of put them in another place.
> 
> PEPs are more about standards, API etc.. and using CouchDB is a detail
> and not relevant for its acceptance

Indeed - if the URLs are specified, I'd probably implement it
"directly", instead of trying to keep a couchdb instance updated.

Regards,
Martin