Better toString impl

git-svn-id: https://svn.apache.org/repos/asf/activemq/activemq-cpp/trunk@1463786 13f79535-47bb-0310-9956-ffa450edef68
ensure count starts at one not zero, makes Id logs match up with counts.

git-svn-id: https://svn.apache.org/repos/asf/activemq/activemq-cpp/trunk@1463787 13f79535-47bb-0310-9956-ffa450edef68