Whitelist or specify queues to process in configuration.yml

[bglusman]

Shoryuken supports this, and we plan to add this and PR when done, we could have used this last week but we just moved the job we needed to segregate back to DelayedJob for now, but we hope to move all our jobs over to toiler and will want to partition them to different boxes based on kind of work and importance. Think this won't be hard to add, but thought I'd open an issue here first to document need/convention, and if you @sschepens or anyone else has preferred interface, happy to consider, otherwise would probably plan to match Shoryuken's interface as a goal.

[sschepens]

@bglusman sound great, having the same interface as Shoryuken seems ok.
I would only be careful to maintain the same behaviour as today by default (say no whitelist is specified the everything is loaded).