Emit pass/fail events on the workshopper instance

[alanshaw]

Exercises have pass/fail events. It would be cool if the workshopper listened for them and re-emitted them so that I can do things like show growl notifications or broadcast exercise pass to a leaderboard server instead of augmenting each exercise or subclassing.

Can create a pull request if you're amenable.

[rvagg]

@alanshaw yep, happy to add that if it's just a case of re-emitting them and not doing anything visible

[kennybytes]

Issue was fixed in #61 - can we close this? =)