CUNY Academic Commons

See #4423, #4524. It's likely that this would all be a part of a single system that creates predictable URLs for subscription feeds.

Ray, can you put this on your radar? There seems to be demand coming from a couple different places (I've heard the request outside of these few tickets) so it'd be cool to do it for 1.9.

I'm closing this as a duplicate of #4524.

Please view that ticket for updated changes.