KAZOO-1978: remove unused module
KAZOO-1978: fix makefile unit testing
KAZOO-1978: fix includes for testing crossbar_bindings
KAZOO-1978: fix testing of get_path
KAZOO-1978: remove direct access of #cb_context{}; delete MOD dbs

When deleting an account db, go backwards from the current year/month to remove
the old MOD dbs as well.
KAZOO-1978: revise docs, not just load them