Moved Request and Response into separate files to get around record
accessor name collisions.  Works.
Aes.hs: trying fully derived Aeson example from _Beginning Haskell_
book.  toJSON works.  fromJSON does not.
Trying to handle nested JSON.  The tests pass, but I have commented out
the drill down for now.  Going to switch to something else.
Getting there.  This works.