message: mirroring the way that Master is stored on the context
diff: @@ -775,9 +775,9 @@ function(Tone){
  Tone.Transport = context.Transport;
  } else {
  Tone.Transport = new TransportConstructor();
  + }
  //store the Transport on the context so it can be retrieved later
  context.Transport = Tone.Transport;
  - }
  });
  return Tone.Transport;
  