queue.host should accept a hostname as well as an IP

[danwdart]

https://github.com/dadi/queue/blob/master/config.js#L18

currently restricts use to only IPs but should also allow hostnames.

[adamkdean]

This should be possible. rsmq-worker doesn't place a restriction on this.

options.host: ( String optional; default = "localhost" ) Host to connect to redis if no rsmq or redis instance has been defined

https://github.com/mpneuried/rsmq-worker