JCLOUDS-423 - Adds support for Rackspace Cloud Files API
  - Added support for CloudFilesApi/CDNApi
  - Added mock/live tests
  - Refactored listFirstPage() and listAt() API methods to list() and listWithOptions(…)
  - General Swift API cleanup: docs and tests
  - Added support for Internal URL
  - Updated JavaDocs and domain objects.
  - Added support for Cloud Files US