Better Event Testing

[rsandor]

To test events we currently have to use a multi-step process:

1. Register a "failure" timeout that will assert false when the tested event fails to trigger (usually happens after 1 second)
2. Register a success handler to the object that should trigger the event that cancels the failure timeout and calls done()
3. Perform the action that should trigger an event

While this is a neat way to do things, it's rather verbose. It would be nice if we could add a couple of helper methods for doing just this. One solution that springs to mind is to create helpers for the failure timeout and the success callback, or we could just roll them all up into one thing.

Either way, very open to suggestions on this one!