KAZOO-1631: custom collector for DTMF, doesn't start timeout until first key press or all subactions are finished
KAZOO-1631: unset pid/ref when down
KAZOO-1631: favor os:timestamp/0 over erlang:now/0
KAZOO-1631: unset the pid/ref
KAZOO-1631: specs galore
KAZOO-1631: updates to logging levels, text, etc
KAZOO-1631: convert some more erlang:now/0 to os:timestamp/0
Merge pull request #167 from 2600hz/KAZOO-1631

Kazoo 1631