Allow symbol as a queue name in shoryuken_options

[serihiro]

What does this PullRequest change?

This PullRequest allows to use symbol for queue name in shoryuken_options.

e.g.

class SymbolQueueTestWorker
  include Shoryuken::Worker

  shoryuken_options queue: :default
end

In this case, :default will be converted to 'default', and work.

Why is this need?

To use Amazon SQS, I was about to convert a sidekiq worker class to a shoryuken worker class.
But my worker was not be handled by shoryuken worker process though I enqueued to SQS with valid format message...

The converted shoryuken worker class is like the following:

class WhatOneceWasSidekiqWorker
  include Shoryuken::Worker

  shoryuken_options queue: :myworker
end

And I noticed that sidekiq worker accepts symbol queue name, but shoryuken does not.

But as far as I read shoryuken's codes , I could not find any special reasons that Shoryken has to force the queue name to be Symbol.

So if there are not any special reasons, I think it is better to allow the Symbol for portability from Sidekiq.

[serihiro]

https://travis-ci.org/phstc/shoryuken/jobs/105426349 ruby2.2.0 build is failed.
I think this is same problem as this #176.

[phstc]

Tks @serihiro! Great fix 🍺 , I've also merged #176 in.

[serihiro]

@phstc Thank you for reviewing and merging! 🍻