Eliminated trailing spaces.

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/pool/trunk@1629509 13f79535-47bb-0310-9956-ffa450edef68
Eliminated trailing spaces.

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/pool/trunk@1629510 13f79535-47bb-0310-9956-ffa450edef68
Added javadoc for StatsStore.

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/pool/trunk@1629515 13f79535-47bb-0310-9956-ffa450edef68