Fix for Mahout-1520

git-svn-id: http://svn.apache.org/repos/asf/mahout/site/mahout_cms/trunk@1588893 13f79535-47bb-0310-9956-ffa450edef68
Renamed 'Core' to 'mrlegacy', fix for MAHOUT-1511

git-svn-id: http://svn.apache.org/repos/asf/mahout/site/mahout_cms/trunk@1589013 13f79535-47bb-0310-9956-ffa450edef68