Trigger singular call hook in cf_exe
Fix makefile so dialyze can run
use e164 normalization on the to and from numbers
Merge branch 'benchan/singular_call_hook' of https://github.com/Sendhub/kazoo into Sendhub-benchan/singular_call_hook
do not ignore CHANNEL_DESTROY event, ensure they are for our call-id, and slight cleanup of cf_singular_call_hooks