[rackspace|queues] Addition of Rackspace Cloud Queues

Added Rackspace Cloud Queues support.

Couple things to note:

* Service Catalog tests don't work yet since it is just in preview and not available in all regions
* Edit Meta-data is not included
* Really interested in feedback on how to handle client-ids and claiming messages.  Both are non-standard concepts in Fog so I did some weird things to make it work.
* I did NOT support V1 authentication.  It has a lot of boiler plate code and figured new services should support the old Auth model.  This may not be the right call but I like having to write and test less code.
* The API returns some really weird status codes sometimes.  Likely need to work with them to tweak the codes.