How to unsubscribe from Observable in RxSwift?
<p>I want to unsubscribe from Observable in RxSwift. In order to do this I used to set Disposable to nil. But it seems to me that after updating to RxSwift 3.0.0-beta.2 this trick does not work and I can not unsubscribe from Observable:</p>

<pre><code>//This is what I used to do when I wanted to unsubscribe
var cancellableDisposeBag: DisposeBag?

func setDisposable(){
    cancellableDisposeBag = DisposeBag()
}

func cancelDisposable(){
    cancellableDisposeBag = nil
}
</code></pre>

<p>So may be somebody can help me how to unsubscribe from Observable correctly?</p>