added assert message

git-svn-id: https://svn.apache.org/repos/asf/qpid/proton/trunk@1522558 13f79535-47bb-0310-9956-ffa450edef68
added --bare option

git-svn-id: https://svn.apache.org/repos/asf/qpid/proton/trunk@1522559 13f79535-47bb-0310-9956-ffa450edef68