licenses and broadcast breaks on story page

This can't be merged or deployed until PRX/PRX.org-Backend#43 gets in – happy to walk through that.

PRX/PRX.org-Backend#45 is also a dependency, but it's a soft one since we will display no information rather than displaying incorrect information if this is deployed before that one.

Basically, just getting the license terms up on the screen. I'd like to get a spinner in place while it's loading but in practice it seems to load way faster than I can scroll down to even see it, and it seems like that would be a good opportunity to do a more generic directive-type thing for page sections that show a spinner pending some promise (or set of promises) being resolved.

The break stuff is pretty ugly, but then, it's not really that good in the designs and looks completely different between the mobile and desktop renderings so I think we have some room to play.