updated prov-o provenance

Paul,

I tweaked the prov-o provenance to align with some of Luc's URI in prov-family, and to update the version URIs described:

https://dvcs.w3.org/hg/prov/rev/7f4f8bf7c9f6

Are these just getting pushed to w3.org/ns, or is there more coordination to do?

Thanks,
Tim