ReactiveX/RxJava — pull request #1651 by zsxwing (2014-08-31 15:16:49+00:00)
Title: RxScala: Fix the problem that Subscriber.onStart isn't called

Just realized #1641 didn't fix the problem in `onStart`. This PR fixed it and added unit tests.

/cc @jbripley, @headinthebox, @samuelgruetter