nodemon quits when the first job worker is done

First, thank you for this fantastic tool.

```
const kue = require('kue');
const ENV = require('/srv/shared/env.js');
const jobs = kue.createQueue({ redis: ENV.REDIS });
const worker = require('./worker.js');

jobs.process('fetch_group', 1, worker);
kue.app.listen(80);
```

I run this code through docker with `nodemon jobs.js` and nodemon quits as soon as the first job has been processed.

Isn't `.process()` supposed to listen to incoming jobs and not return?

Start with the supplied jobs.js example, worker.js, and the jobs.process('fetch_group', 1, worker) call; run it under nodemon in Docker and observe what happens after the first job completes. Trace the worker and queue lifecycle, then verify that the process continues listening for incoming jobs instead of exiting.

Written by the indexing model from the issue text.