MAHOUT-1194 Allow to change java target version during the build by Jarek Jarcec Cecho

git-svn-id: https://svn.apache.org/repos/asf/mahout/trunk@1488712 13f79535-47bb-0310-9956-ffa450edef68
MAHOUT-993 Some vector dumper flags are expecting arguments (tom pierce)

git-svn-id: https://svn.apache.org/repos/asf/mahout/trunk@1488713 13f79535-47bb-0310-9956-ffa450edef68