Ability to disable twilio signature verification via configuration setting

[tonyschwartz]

Enhancement request: Please allow us to disable the Twilio signature verification. We receive the twilio callback in a secure application in our DMZ which does the signature verification itself. Then, a completely separate app needs to pick up that message and deliver it to the GoAlert system. I am protecting GoAlert completely from any external threats. I wish to remove/disable verification. If that is unacceptable, I need some way to alter the host because it's completely different from what Twilio sees. Thank you for your consideration.

[mastercactapus]

I can see the use case; we've run into this a couple of times as well.

I feel like it may be better as a CLI flag/env variable though. That way disabling the security check would happen based on the environment rather than the global application config.