Add Java Doc.

git-svn-id: https://svn.apache.org/repos/asf/creadur/rat/branches/gsoc@1549404 13f79535-47bb-0310-9956-ffa450edef68
Apply PMD change.

git-svn-id: https://svn.apache.org/repos/asf/creadur/rat/branches/gsoc@1549405 13f79535-47bb-0310-9956-ffa450edef68