Error Event Bug and v3

[grantcarthew]

I had a few hours up my sleeve and decided to write the last couple of tests to get the coverage up.

In doing so I discovered an API design flaw which caused an exception whilst throwing error events.

I posted on the Nodejs Help repository and @bnoordhuis has raised a pull request for Nodejs.

To fix this error I will need to change the public API for rethinkdb-job-queue which in turn means bumping the version up to the next major version due to SemVer.

The specific Public API change will be moving from having the Queue.id as the first argument for all events to having error objects as the first argument for error events. I will add the Queue.id to the error objects before raising the event.

[grantcarthew]

v3 published fixing the error event API issue.
Please read Event.error for the error event syntax.