Github user marevol commented on the pull request:
https://github.com/apache/incubator-predictionio/commit/947db5e1b6e1ff629ef5bcb4412c92309e2a1354#commitcomment-21281853
@dszeto To fix travis error, the following change will be needed:
https://github.com/travis-ci/travis-ci/issues/6534#issuecomment-285955314
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