* Parse and log the Twilio error code
* Automatically retry without sender ID when Twilio returns unreachable
* Remove attempt count and pass around whether or not sender id was used
* Remove arbitrary SMS code
This code has run its course and is no longer needed for now.
* Add elements to sample config that were left out
* Add a messaging service for NANPA
* Fixup sample config capitalization
The rules around selecting sender ids can get complicated with some
countries not supporting it and others requiring pre-registration that
may result in having a different sender id for that country than
others. This strategy class handles the logic of dealing with this
expanded configuration and applying the appropriate sender id or none
when it's not appropriate to do so at all.
