MAHOUT-1126: add in unpack options to control exclusion of LICENSE file

git-svn-id: https://svn.apache.org/repos/asf/mahout/trunk@1491190 13f79535-47bb-0310-9956-ffa450edef68
MAHOUT-1103: properly partition the data for MapReduce

git-svn-id: https://svn.apache.org/repos/asf/mahout/trunk@1491191 13f79535-47bb-0310-9956-ffa450edef68