QEmitter

Node.js event emitter with promises support.

Node.js builtin EventEmmiter class executes all handlers synchronously without
waiting for completion of any async operations that may happen inside.

QEmitter is the subclass of EventEmmiter which adds ability to return a
promise from event handler and wait until it resolved. Just use emitAndWait
instead of emit:

``javascript
var emitter = new QEmitter();
emitter.on('event', function() {
return Q.delay(1000);
});

emmiter.emitAndWait('event')
.then(function() {
console.log('All handlers finished');
});
`

emitAndWait returns Q promise.

utils

$3

Passes event from from to to.

event` can be an array of events.