support maximum test heap size
support maximum test heap size

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