outbound trunk support

Needed to update outbound_trunks quantities doc in the services db! woot
KAZOO-3147: log stacktraces in gen_listener client errors

Conflicts:
	core/whistle-1.0.0/src/gen_listener.erl
KAZOO-3147: logging to info in transfer
KAZOO-3147: cleanup removal of bindings
KAZOO-3147: set flags based on b-legs available or not
Merge pull request #664 from vccs/vccs-dev

outbound trunk support
unify_amqp_pools: allow configuration for pool size and pool overflow

allow configuration for pool size and pool overflow in config.ini
fold endpoint without device doc
KAZOO-3035: formatting, dialyzer fixes
KAZOO-1109: Support per account, device, or user call recordings
KAZOO-1109: refactor case clauses into functions