Restore broadcast events

Is this safe enough? What if `launcher1` loads slower? If you want to be more safe, you can add two `beforeEach`es:

```
beforeEach(function(done){
  launcher1 = createLegacyLauncher();
  launcher1.addEventListener('rendered', done);
  document.body.appendChild(launcher1);
});
```
And the same for `launcher2`.