KAZOO-2431: remove unused macro
KAZOO-2431: only save the auth doc to the DB once its half-again as old
as the cached version. Since we clean them out after their modified
timestamp is an hour old, save new versions after the new version's
modified time is 30 minutes or more newer.
KAZOO-2431: flush the couch cache after successfully saving a doc
Merge pull request #323 from 2600hz/KAZOO-2431

Kazoo 2431