Integrate with Twilio

[jpf]

A neat feature to add would be to send SMS reminders to people who have incomplete tasks.

With a little extra work, this could be done so that if someone responded "done" to a reminder, that goal would get "checked"

[choogiesaur]

I could probably help you with this if you're still working on it.

[mrooney]

It isn't a particular priority @choogiesaur, though if you want help I'm happy to mentor the change :)