KAZOO-2213
KAZOO-2146: use quoted-printable transfer encoding for voicemail notification email
Fix for onnet detection in singular call hook
Add support for greeting intro prompt and customized generic unavailable greeting
Fixes after compiling and testing
provide temporary/generic voice prompts
Call transfers are accounted as if they were made to the original caller
Remove onnet detection fix
Merge branch 'KAZOO-2213' of https://github.com/onnet/kazoo into onnet-KAZOO-2213
KAZOO-2213: centralize normalize_account_name/1
KAZOO-2213: use centralized version
KAZOO-2133: add flush_account/1 to remove all endpoints in the cache for an account db
KAZOO-2213: cleanup maintenance routines to set classifier actions on accounts/devices
Merge branch 'onnet-KAZOO-2213'
Merge pull request #286 from bpdavis-scratch/VoicemailCustomizations

KAZOO-2238 voicemail app prompt customizations
Merge branch 'KAZOO-2146' of https://github.com/bpdavis-scratch/kazoo into bpdavis-scratch-KAZOO-2146
KAZOO-2146: add optional content-transfer-encoding headers
KAZOO-2146: add get_ne_binary/{2,3,4} to whapps_config
KAZOO-2146: use quoted-printable transfer encoding for voicemail notification email
KAZOO-2146: add optional content-transfer-encoding headers