ReactiveX/RxJava — pull request #1726 by benjchristensen (2014-10-06 03:47:29+00:00)
Title: Fix Merge: backpressure + scalarValueQueue don't play nicely 

Manual merge of unit tests and fix by @dmgd for https://github.com/ReactiveX/RxJava/issues/1723

Thank you @dmgd for debugging this as `merge` is very complicated code (unfortunately).