Netflix/RxJava — pull request #910 by benjchristensen (2014-02-20 17:19:00+00:00)
Title: Remove groupBy with selector.

I think we can use `groupBy(keySelector).map(elementSelector)` instead. Is there any reason to keep this signature?

Related to https://github.com/Netflix/RxJava/commit/02ccc4d727a9297f14219549208757c6e0efce2a#commitcomment-5430646