new Rackspace API/SDK: done

git-svn-id: https://plugins.svn.wordpress.org/updraftplus/trunk@816473 b8457f37-d9ea-0310-8a92-e5e31aec5664
new Rackspace API/SDK: done

git-svn-id: https://plugins.svn.wordpress.org/updraftplus/trunk@816476 b8457f37-d9ea-0310-8a92-e5e31aec5664