Echo JS 0.11.0

1. The tests could be a little stricter, what I have it just an example.

2. You're right, it should have been:

  // if name is omitted
  args.splice(0, 0, null);

  // if deps is omitted
  args.splice(1, 0, [])

  // if fn is ommited
  args.splice(2, 0, noop);

I'll edit the post when I get a chance