servant-auth+servant-streaming integration

[domenkozar]

After #14 is merged, one still needs:

{-# LANGUAGE TypeFamilies         #-}
{-# LANGUAGE UndecidableInstances #-}

import Servant.Auth.Server.Internal.AddSetCookie (AddSetCookieApi, AddSetCookieApiVerb)
import Servant.Streaming.Server                             (StreamResponse)

type instance AddSetCookieApi (StreamResponse method stat ctyps)
  = AddSetCookieApiVerb (StreamResponse method stat ctyps)