OPENNLP-703 Improved NegLogLikelihood so that it runs faster and uses less memory

git-svn-id: https://svn.apache.org/repos/asf/opennlp/trunk@1612182 13f79535-47bb-0310-9956-ffa450edef68
OPENNLP-703 Added a parallel version of NegLogLikelihood. Added a test case for it. Updated the parameter list of MaxentQN.

git-svn-id: https://svn.apache.org/repos/asf/opennlp/trunk@1612184 13f79535-47bb-0310-9956-ffa450edef68