* Implement Twilio SMS notify MediaUrl support
Adds support for setting the `media_url` parameter of the twilio API
client with an optional attribute under the notify `data`
attribute.
Per the twilio docs (https://www.twilio.com/docs/sms/send-messages#include-medi$
this feature is only available in the US and Canada, for
GIF, PNG, or JPEG content.
* lint: fix 80 char ruler
* use kwargs to set the media_url
after testing locally, seems like the previous way of using
object() was not working. this seems to be working
* re-use the ATTR_MEDIAURL attribute
Fabian Affolter
Paulus Schoutsen
Chris Johnston
cgtobi
Robbie Trencheny