Initial implementation of OpenStack Marconi and Rackspace Cloud Queues.

https://issues.apache.org/jira/browse/JCLOUDS-340

Had to include both because there's no implementation of Marconi in DevStack yet and Cloud Queues is the only deployment of Marconi right now for testing.

To run the live tests do:

    cd rackspace-cloudqueues-us/
    mvn -Plive -Dtest.rackspace-cloudqueues-us.identity=raxUsername -Dtest.rackspace-cloudqueues-us.credential=raxApiKey clean install

Definitely looking for feedback on this before committing.