until

unitl is a very simple helper object that helps on waiting multiple EventEmitter. It is an EventEmitter itselt, and it waits for all the EventEmitter firing success events, or one of them firing failure event.
The APIs are

var waitings = new require('until').Waitings();
waitings.add(EventEmitter      e,
             Array or String   success events,
             Array or String   fail events,
             Array or String   notification events)

An example:

var waitings = new until.Waitings();
waitings.add(emitter,         // The emitter object
             ['ok', 'done'],  // A list of event names that stand for success.
             ['bad', 'fail'], // A list of event names that stand for failure.
             ['progress']);   // A list of event names will continuously send.

Event: 'ok'

TODO

Event: 'error'

TODO

Event: 'notice'

TODO