There were a couple optional url parameters detailed in the REST API docs that were not currently implemented in this library:
I also added some casting of numeric params to int, not sure if it would make more sense to instead check whether they are ints and throw an exception if they're not?
Implemented optional url params per REST API documentation
* per_page for IronMQ#getQueues
* timeout for IronMQ#getMessages and IronMQ#getMessage
Thanks for your help!