Remove the 504 Gateway Timeout for vendor unreachable
Remove the 504 Gateway Timeout for vendor unreachable

https://github.com/badges/shields/issues/529#issuecomment-158550989

Part of #445

Reverts beebab62328

badges/shields,pine613/shields,mahirk/shields,tomap/shields,tomap/shields,freezy-sk/shields,malditogeek/shields,freezy-sk/shields,mahirk/shields,malditogeek/shields,pine613/shields,badges/shields,badges/shields