PROTON-448: Backing out the Ruby data change.

Seems it's having a separate problem with strings not properly encoding.
The tests started to fail, so I'll pull this until I can fix them.

git-svn-id: https://svn.apache.org/repos/asf/qpid/proton/trunk@1539656 13f79535-47bb-0310-9956-ffa450edef68