Include hadoop common and hdfs jars in the package
Add some comments, clean up some parts
Adjust length of kappa vectors if classVotes.length is different from current numClasses. (Are classVotes.length of all instances supposed to be the same?)
Revert "Adjust length of kappa vectors if classVotes.length is different from current numClasses. (Are classVotes.length of all instances supposed to be the same?)"

This reverts commit 6d46c1be94e686797879cd3b6ac860ab47b3ccee.
Use instance.numClasses() to init Kappa array in evaluator
Remove debug print in BasicClassificationPerformanceEvaluator
Merge with samza branch (Some clean up, fix bug with size of array in evaluator)