Netflix/RxJava — pull request #1282 by abersnaze (2014-05-29 21:49:04+00:00)
Title: utility function for creating observables for closeable resources

#1199 the answer to the issue was nagging at me when I tried to recommend it recently. I think @zsxwing's solution was ok but would fail if there were repeated subscriptions to the observable returned. I created a utility function on StringObservable to make it easier to use `using()` for objects that implement the `AutoCloseable` interface.

PS. I made a breaking change to arguments of `join(Observable