MRUnit is test scope. Single use of Commons IO can easily be removed and replaced with Guava, already a dependency. Update versions of a few things in integration

git-svn-id: https://svn.apache.org/repos/asf/mahout/trunk@1508743 13f79535-47bb-0310-9956-ffa450edef68
MAHOUT-1296: Remove deprecated algorithms, removing reference to Dirichlet clustering from cluster-reuters.sh

git-svn-id: https://svn.apache.org/repos/asf/mahout/trunk@1509319 13f79535-47bb-0310-9956-ffa450edef68