message: timeline throws error with no time argument
diff: @@ -52,6 +52,15 @@ define(["Test", "Tone/core/Timeline"], function (Test, Timeline) {
  sched.dispose();
  });
  + it ("throws an error if no time is provided in object", function(){
  + var sched = new Timeline();
  + expect(function(){
  + sched.add({
  + "no_time" : 0
  + });
  + }).to.throw(Error);
  + sched.dispose();
  + });
  it ("can remove items from the timeline", function(){
  var sched = new Timeline();
  