[rackspace] first commit of adding CDN to storage provider
[rackspace] adding setCdnEnabled functions to containers
[rackspace] adding cdn purge methods
[test] adding cdn tests for rax containers
[Rackspace] Adding proper setCdnEnabled method
[minor] removing console statement"
Merge pull request #161 from rackspace/rackspaceCDN

Add Support for Rackspace CDN enabled Containers