More work on metadata view.
Merge pull request #283 from orta/tiles

@ashfurrow => Image Previews
Artwork metadata view complete.
Some cleanup.
Merge branch 'master' of github.com:artsy/eidolon into details-view

Conflicts:
	Kiosk/App/Models/Image.swift
	Kiosk/Kiosk.playground/section-1.swift
Fixed Artwork stubbed response.
Updated Gemfile.lock.
Fixed estimate label padding.
Merge pull request #284 from AshFurrow/details-view

@orta => Artwork Metadata View
Finished up basic metadata view.
Removed unnecessary view tags.
Updated changelog.
Reverts change to countdown timer.
Fixes #286.
Merge pull request #285 from AshFurrow/details-view

@orta => Finished up basic metadata view.
Merge pull request #289 from AshFurrow/help-menu-bug

@orta => Fixes #286.
add support for dealing with a card reader failure