turn on Travis builds for Gradle
turn on Travis builds for Gradle

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