Possibility to pass extra results with error

Hi,
I have an ability to send an extra info when error hand happened.
Is that possible to do?

Like that:

``` js
done(new Error('test'), {extraData: 1});
```

For now second param never be send to kue

No file or test is named. Start by tracing how the done(error, ...) callback is handled and how job results are sent to Kue, then check existing tests around error and result propagation; done should preserve the extraData object and expose it to the receiving side.

Written by the indexing model from the issue text.