[maven-release-plugin] prepare release activemq-cpp-3.6.0

git-svn-id: https://svn.apache.org/repos/asf/activemq/activemq-cpp/branches/activemq-cpp-3.6.x@1452345 13f79535-47bb-0310-9956-ffa450edef68
[maven-release-plugin] prepare for next development iteration

git-svn-id: https://svn.apache.org/repos/asf/activemq/activemq-cpp/branches/activemq-cpp-3.6.x@1452347 13f79535-47bb-0310-9956-ffa450edef68