ReactiveX/RxJavaString — pull request #8 by davidmoten (2014-12-05 10:50:37+00:00)
Title: add check for unsubscribed before next read 

A while back I contributed a PR to add this check for ```StringObservable.from(InputStream)```. The same check for unsubscribed should also be against ```StringObservable.from(Reader)```.

Included unit test in PR.