add a maven build for file cache

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/jcs/trunk@1591164 13f79535-47bb-0310-9956-ffa450edef68
start working on rat fixing

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/jcs/trunk@1591165 13f79535-47bb-0310-9956-ffa450edef68
rat check pass now

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/jcs/trunk@1591172 13f79535-47bb-0310-9956-ffa450edef68