Completed BayesUpdateRequest processor update for new Mahout Bayes Classifier.

 - Added tool to generate Mahout Bayes Classifier category vectors from a Lucene index.
 - Added tool to generate a FST based dictionary from Mahout seq2sparse dictionary output.
 - Implemented IncrementalVectorizer which uses FST dictionary to create text vectors for input Strings.
 - Implemented TextClassifier which ties IncrementalVectorizer with the Mahout Bayes Classifier to classify individual text inputs. Also creates sets of labeled ClassifierResults from score vectors.
 - Updated BayesUpdateRequestProcessorFactory/BayesUpdateRequestProcessor to use new infrastructure.
 - Added many unit tests, etc.