KAZOO-866: fix invalid JSON in schemas
KAZOO-866: remove schema and servers, add schemas; also fix some tickies
KAZOO-866: fix some tickies
KAZOO-866: fetch default realm from the config db, and fetch a couple other values as well
KAZOO-866: Add casting functions to config getter
KAZOO-866: update how the To, From, and Request are populated (based on direction)
KAZOO-866: remove the presence state tracking
KAZOO-866: remove refs to the presence tracking code
KAZOO-866: remove rest of presence tracking code
KAZOO-866: deprecate the json_object() types and update tickies
KAZOO-866: update specs
KAZOO-866: just save the sub directly, don't republish
KAZOO-866: find subs by either from or to, add direction to optional headers
KAZOO=866: Add get_first_value/3
KAZOO-866: update logging a bit