Merge pull request #277 from AshFurrow/details-view

@orta => Rearranges top-level elements
fix masonry padding - fixes #273
Merge pull request #278 from orta/networking

@ashfurrow => fix masonry padding - fixes #273
RAC signal for pings to artsy
Merge pull request #279 from orta/networking

@ashfurrow => RAC signal for pings to artsy
More work on metadata view.
Artwork metadata view complete.
Some cleanup.