Filter out negative user-item signals before generating user recommendations.
Use Float compareTo
Zero out negative user-item weights.
Merge pull request #20 from mortardata/jkarn_negative_ui_signal_filter

Filter out negative user-item signals before generating user recommendat...
Merge branch 'master' of github.com:mortardata/mortar-recsys

Conflicts:
	udfs/java/recsys-udfs.jar