Linking to datastream fcr:metadata in HTML UI

Fixes https://www.pivotaltracker.com/story/show/80952408
I'm :+1: for including that information everywhere it is relevant, but I don't think it's that easy. Non-binary resources can show up:

- as contained resources of a node
- as LDP member resources
- as objects of reference properties

I spent time last week trying to do just that, and it means redoing a large part of our RDF serialization tools. I don't see how a simple javascript query is that hard to do.