Proton 0.6 tag and branch

git-svn-id: https://svn.apache.org/repos/asf/qpid/proton/tags/0.6@1558212 13f79535-47bb-0310-9956-ffa450edef68
Setup a redhat patch branch off the 0.6 release.
Fix for PROTON-474: Incorrect mapping of TTL to JMSExpiration in JMS InboundTransformer