JCLOUDS-489 - Adds support to Cloud Files for the iOS Streaming URI

This PR adds the support for the iOS Streaming URI feature to the Cloud Files API.

Changes:
- added iOS URI field to CDNContainerContainerMetadata
- removed legacy "referrer_acl" and "useragent_acl" fields and accessor methods
- updated toString() method
- updated parsing of the CDN container name, instead of just using the path:
/v1/MossoCloudFS_187f55c5-8312-48a4-9d85-a18e69bbe9dc/someContainer -> someContainer

To run live tests, go to the "jclouds/apis/cloudfiles" directory and run the following command:

mvn -Plive clean install "-Dtest.cloudfiles.identity=username" "-Dtest.cloudfiles.credential=apiKey" "-Dtest.cloudfiles.endpoint=https://identity.api.rackspacecloud.com/"

This will also need to be backported to the 1.7.x branch.