Add missing javadoc and license header.
Add missing javadoc and license header.


git-svn-id: 9ccbd9d86b746f4b66ec41278f73faea0938905b@536623 13f79535-47bb-0310-9956-ffa450edef68

commoncrawl/nutch,commoncrawl/nutch,commoncrawl/nutch,commoncrawl/nutch