Support custom output formatters

[modocache]

Luckily, some nerd wrote down how RSpec implements custom output formatters.

An example in Objective-C can be found here: kiwi-bdd/Kiwi#449

I wonder if it'd be possible to implement an output formatter that aggregates results and displays an OS X notification with a breakdown of passed, pending, failed, and errored?

[modocache]

Parameters passed to formatters should include the number of pending examples, as described in #38. At that point pending examples should stop printing directly via NSLog.

[karapigeon]

What's the status on this?

[modocache]

This is a sort of "wishlist" feature, I'm not working on it at the moment. :)