MAHOUT-1292:lucene2seq should validate the 'id' field

git-svn-id: https://svn.apache.org/repos/asf/mahout/trunk@1542553 13f79535-47bb-0310-9956-ffa450edef68
MAHOUT-1292:lucene2seq should validate the 'id' field

git-svn-id: https://svn.apache.org/repos/asf/mahout/trunk@1542596 13f79535-47bb-0310-9956-ffa450edef68
MAHOUT-1343: Replaced deprecated Lucene 3.x API with equivalent Lucene 4.x API.

git-svn-id: https://svn.apache.org/repos/asf/mahout/trunk@1542647 13f79535-47bb-0310-9956-ffa450edef68
MAHOUT-1351:Adding DenseVector support to AbstractCluster

git-svn-id: https://svn.apache.org/repos/asf/mahout/trunk@1542650 13f79535-47bb-0310-9956-ffa450edef68