First rev mobile home page

Adds a default mobile home page view based off of a PRX playlist.  (Playlist to be changed before deploy, obv -- this one chosen because it has curator comments on the stories.)

This PR depends on the creation of prx-backend representers for which implementation is in progress.  It can be run against the picks branch of the prx-backend in the meantime.  

The PR should not be merged until the backend is in place and any changes are made to this to make it work w/ the API, but I'm putting it up now so I can start taking notes and fixing things up.