Issue #69 fixed ALS paper link
Better debug logging in the case of the most stable kmeans eval strategy
Update typesafe config, jpmml, shade plugin versions
Closes issue #71 : make default build for Hadoop 2.3.0
Misc typo fixes
Refactor output() method to simplify and accommodate other types
Adjust ALS output method too
Issue #59 : add popularRepresentativeItems() method as an experiment