title: Twilio functions calling other Twilio functions
body: <p>My Twilio function is in danger of getting too large and unwieldy. I'd like to break it up into smaller functions, and have the 'master' function call the other functions to get data as needed.</p>
  
  <p>I don't see anything in the documentation about this, and the few tests I've tried have not been successful. Is there an easy/best way to go about doing this? Thanks!</p>