KAZOO-557: update whistle_couch lib specs/types
KAZOO-557: track and send CDR to cdr_url (if included in queue config)
KAZOO-557: bind to cdr events if cdr_url is available
KAZOO-543: cli status of queues
KAZOO-543: change the -r flag to -f for the clean option
KAZOO-543: update return/spec