tweaked ruby path

git-svn-id: https://svn.apache.org/repos/asf/qpid/proton/trunk@1494964 13f79535-47bb-0310-9956-ffa450edef68
use Data.get_object

git-svn-id: https://svn.apache.org/repos/asf/qpid/proton/trunk@1494969 13f79535-47bb-0310-9956-ffa450edef68