support checking for a credit card, and logging in via the login
registration internal nav
First pass.
Integrated Ken Ferry's suggestion :tada:.
Merge remote-tracking branch 'artsy/master' into tabular
merge
Spacing.
Added KVO-stuff.
Merge pull request #101 from orta/api

@ashfurrow => Cards, Login & Registration
Merge remote-tracking branch 'artsy/master' into tabular

Conflicts:
	Kiosk.xcodeproj/project.pbxproj
Laura's feedback.
fix for storyboard
Merge pull request #104 from orta/api

@ashfurrow => fix for storyboard
Merge branch 'master' of github.com:artsy/eidolon into tabular
Merge pull request #100 from AshFurrow/tabular

@1aurabrown => Tabular collection view layout
Sorting.
Added sorting tests.
Updated snapshots.
Merge pull request #105 from AshFurrow/sorted

@orta => Added sorting capability to listings view controller
RAC for current bid, opening bid, bid validation