Adds artsy oauth2 authentication
Adds artsy oauth2 authentication

mzikherman/metaphysics-1,artsy/metaphysics,craigspaeth/metaphysics,craigspaeth/metaphysics,artsy/metaphysics,1aurabrown/metaphysics,broskoski/metaphysics,mzikherman/metaphysics-1,artsy/metaphysics,mzikherman/metaphysics-1,mzikherman/metaphysics-1