KAZOO-3198: fetch a specific header
KAZOO-3198: delete attachment based on content_type
KAZOO-3198: note if a template is soft-deleted
KAZOO-3198: update logging
KAZOO-3198: determine whether to try loading from system
KAZOO-3198: encode the doc id before creating the routing key
KAZOO-3198: remove log line
KAZOO-3198: return error if attachment doesn't exist
Merge pull request #682 from 2600hz/KAZOO-3198

Kazoo 3198