Twilio Interface for the Rube Goldberg Machine

Here's how I built the Twilio interface to the Rube Goldberg machine...

1. Install the Twilio python libraries: sudo pip install twilio
2. Set up a feature branch for Twilio: git checkout -b twilio-plugin
3. Set up tests and code to load credentials from twilio.secret file
4. From the secret file load the account_sid and auth_token
5. Write the update_state() method to send an SMS with Twilio
6. Decided not to unittest the SMS sending as this is just simple interface code with no logic
7. Used the python code documented at:  https://www.twilio.com/user/account/developer-tools/api-explorer/message-create
8. With a bit of Blu Tack, and some dominoes the system worked: http://youtu.be/Vj7IvwIN0r4