Testing : Adding reference to Steve Miner's Herbert library.

project.clj
-- Add dev dependency on [com.velisco/herbert "0.6.1"]

schematode_test.clj
-- Start at test file for schematode-related functions in Hatch.
   No tests yet. Trying to resolve issue where the grammar fn in the
   Herbert library cannot be found (and, in fact, does not appear to
   be in the source on github (? I must be doing something wrong.)

--Tom