async.queue.unsaturated

[ecasilla]

I want to create a pull request for the ability to get notified when my queue has become unsaturated by using the same api as saturated i was thinking some along these lines

if (q.tasks.length <= (q.concurrency - q.buffer) ) {
q.unsaturated();
}
and allow the user once the queue has been created to add there own buffer of have some default number or percentage.. I want to know if this is something the core team is interested in and there not currently working on

[aearly]

Closing this to keep the discussion on #869