MAHOUT-1265: Multilayer Perceptron

git-svn-id: https://svn.apache.org/repos/asf/mahout/trunk@1552403 13f79535-47bb-0310-9956-ffa450edef68
MAHOUT-1384: Executing the MR version of Naive Bayes/CNB of classify_20newgroups.sh fails in seqdirectory step.

git-svn-id: https://svn.apache.org/repos/asf/mahout/trunk@1552538 13f79535-47bb-0310-9956-ffa450edef68