Keep this all up-to-date.
Removing quimby.
Adding new foursquare library.
New photo URL stuff.
New photo_url syntax.
New Foursquare stuff in these controllers.
Paginate through checkins like so.
New timezone handling.
New Venue mirrorer.
This now uses new API.
Updating these to use mashie correctly.
And that's the mirrorer updated.
Extract Foursquare version into a config variable.
Abstracting all the foursquare and oauth clients into their own class, which can be used elsewhere.