Add a storeConentAndClear() method to message so that we can lower the memory impact of embedded broker usage.

git-svn-id: https://svn.apache.org/repos/asf/activemq/trunk@1481527 13f79535-47bb-0310-9956-ffa450edef68
Increase the default auto compaction ratio.

git-svn-id: https://svn.apache.org/repos/asf/activemq/trunk@1481528 13f79535-47bb-0310-9956-ffa450edef68