Threaded worker

[ryansmith3136]

queue_classic could operate much more efficiently if the worker were able to fetch N number of jobs and work the jobs on N threads where N > 1. Of course we could set N=1 as a default for ruby apps that are not thread safe.

[senny]

👍

[ryansmith3136]

Here is some prior art: https://github.com/ryandotsmith/komrade-client/blob/master/lib/komrade-client/worker.rb#L34

[ryansmith3136]

Tracking in #159