Simplified HashMap declaration now that Id commands have getHashCode.

git-svn-id: https://svn.apache.org/repos/asf/activemq/activemq-cpp/trunk@1460469 13f79535-47bb-0310-9956-ffa450edef68
Refined hash code templates.

git-svn-id: https://svn.apache.org/repos/asf/activemq/activemq-cpp/trunk@1460470 13f79535-47bb-0310-9956-ffa450edef68