title: Where is Observable#asObservable() in RxJava2?
body: <p>I would like to observe my <code>BehaviourSubject</code>. In RxJava 1 I was calling <a href="http://reactivex.io/RxJava/javadoc/rx/Observable.html#asObservable()" rel="noreferrer">asObservable()</a>, which is now gone. </p>
  
  <p>I found <a href="http://reactivex.io/RxJava/javadoc/rx/Observable.html#publish()" rel="noreferrer"><code>publish()</code></a> but it returns connectable, which I don't want to.</p>
  
  <p>How to turn behavior subject into observable in RxJava 2?</p>