Removes Iterable and iterateNonZero() from Vector interface, replaces with two Iterable-returning methods fixes MAHOUT-1227

git-svn-id: http://svn.apache.org/repos/asf/mahout/trunk@1486122 13f79535-47bb-0310-9956-ffa450edef68
MAHOUT-1213: SSVD job doesn't clean it's temp dir, and fails when seeing it again

git-svn-id: http://svn.apache.org/repos/asf/mahout/trunk@1486388 13f79535-47bb-0310-9956-ffa450edef68
Merge remote-tracking branch 'upstream'