[jclouds-labs-openstack] Adds support for Rackspace Cloud Files API (#79)

This PR adds initial support for the Rackspace Cloud Files API. There are many changes in this PR and will address comments immediately. Thanks. JIRA: https://issues.apache.org/jira/browse/JCLOUDS-423 Additions: - Added support for CloudFilesApi/CDNApi - Added mock/live tests -

Re: [jclouds-labs-openstack] Adds support for Rackspace Cloud Files API (#79)

[jclouds-labs-openstack-pull-requests #164](https://jclouds.ci.cloudbees.com/job/jclouds-labs-openstack-pull-requests/164/) SUCCESS This pull request looks good --- Reply to this email directly or view it on GitHub: https://github.com/jclouds/jclouds-labs-openstack/pull/79#issuecomment-35110792

Re: [jclouds-labs-openstack] Adds support for Rackspace Cloud Files API (#79)

@jdaggett Just to make sure I'm getting this right...this is a different/new version of the CloudFiles API as that covered by the [current provider](https://github.com/jclouds/jclouds/blob/master/apis/cloudfiles/src/main/java/org/jclouds/cloudfiles/CloudFilesApiMetadata.java)? If so, could you