Workers with wildcard queue will find new queues

[evantahler]

If worker.queues = ['*'], this PR adds functionality to re-scan the list of queues that exist before every worker#sleep. In this way, if the worker has no jobs to perform in the queues it knows about, it will check for new queues.

closes #412

[glensc]

my personal preference is never to do such single line code "optimizations":

1. ...
2. using consistent style
3. inexperienced developer may be adding extra code that they think is grouped by condition but really is just standalone statement

-    if (!this.running) return;
+    if (!this.running) console.log("running"); return;

[glensc]

I think the documentation should be updated, that there are some drawbacks using "*" queue:

• minor performance impact for checking the queues
• undefined order of queues

[evantahler]

I think the documentation should be updated, that there are some drawbacks using "*" queue:

• minor performance impact for checking the queues

• undefined order of queues

Awesome! Please submit a pull request with that language!

[glensc]

this should have been minor version not patch version according to semver.

[evantahler]

Interesting! I view this as a bug that was fixed. Folks assumed that * would find new queues, yourself included. Aren't bugfixes to be patches?

[glensc]

Seems to me a new feature that "*" would pick up new queues without restarting application :)

also, I never used this feature, I stumbled on it when doing code-review of this project.

[glensc]

#420