Return job-specific EventEmitter from enqueue

[rfk]

It would be nice if the job could send back asynchronous progress or logging messages as it goes about its job. Idea: enqueue could return an EventEmitter specific to that job, and the worker could have an API for sending async events to it.

[lfreneda]

I really need this, did you solve @rfk?

[rfk]

I did not ever cycle back around to trying out an implementation of this, sorry

[lfreneda]

Thanks :(