Github user HyukjinKwon commented on the issue:
https://github.com/apache/incubator-predictionio/pull/268
And actually, there are guidelines for making PR here
http://predictionio.incubator.apache.org/community/contribute-code/#how-to-issue-a-pull-request.
It would be even nicer if the title of this PR follows `[PIO-19] ...` format
like other PRs as described the link :).
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