MAHOUT-1339 Add RAT check, fix license problems

git-svn-id: https://svn.apache.org/repos/asf/mahout/trunk@1525203 13f79535-47bb-0310-9956-ffa450edef68
Oops, typo in last commit for MAHOUT-1339

git-svn-id: https://svn.apache.org/repos/asf/mahout/trunk@1525208 13f79535-47bb-0310-9956-ffa450edef68