First pass at sync.
Fixes return-nil problem.
Merge branch 'master' of https://github.com/artsy/eidolon into passwords
Modified ~> operators.
Merge pull request #154 from AshFurrow/rac-thingy

@orta => Modified ~> operators.
Merge branch 'master' of https://github.com/artsy/eidolon into passwords
Merge pull request #153 from 1aurabrown/master

@orta => Update ConfirmYourBidArtsyLoginViewController.swift
Merge branch 'master' of https://github.com/artsy/eidolon into passwords
support flowing existing in users through a VC that checks if they exist
Merge pull request #155 from orta/passwords

@1aurabrown => support checking for an existing account
standardise staging and the default auction id
Merge pull request #156 from orta/placingbid

@ashfurrow => standardise staging and the default auction id
fix switch view
Merge pull request #157 from 1aurabrown/switch-view

@orta => fix switch view
registation + user updater improvements
Merge pull request #158 from orta/placingbid

@1aurabrown => registation + user updater improvements
update to use new API for checking users
fix soem fonts and nil provider
Merge pull request #161 from 1aurabrown/some-changes

@orta => fix some fonts and `nil` provider
Merge pull request #159 from orta/placingbid

@1aurabrown => update to use new API for checking users