fix and improve groovy logging
fix and improve groovy logging

binweiwu/lenskit,amaliujia/lenskit,aglne/lenskit,tajinder-txstate/lenskit,vaibhav345/lenskit,vaibhav345/lenskit,martinlaz/lenskit,vijayvani/Lenskit,martinlaz/lenskit,binweiwu/lenskit,tajinder-txstate/lenskit,blankazucenalg/lenskit,tajinder-txstate/lenskit,chrysalag/lenskit,kluver/lenskit,kluver/lenskit,amaliujia/lenskit,kluver/lenskit,kluver/lenskit,vaibhav345/lenskit,linjunleo/lenskit,tajinder-txstate/lenskit,chrysalag/lenskit,linjunleo/lenskit,vijayvani/Lenskit,blankazucenalg/lenskit,aglne/lenskit,vaibhav345/lenskit,kluver/lenskit