Added Weka files/jars/that sort of thing.
Also, added KNNPrediction class file. So far, it trains the model from
60% of the dataset and predicts the closest 3 documents to the other 40%
of the dataset.  The dataset is the WordCount file, but this is passed
as an argument.  Also, the percentages of training/testing can be
changed as well.
Doesn't associate the nearest docs with topics yet though... working on
it.