title: Is SingleLiveEvent actually part of the Android Architecture Components Library?
body: <p>I have been using the <code>SingleLiveData</code> class which can be found <a href="https://github.com/googlesamples/android-architecture/blob/dev-todo-mvvm-live/todoapp/app/src/main/java/com/example/android/architecture/blueprints/todoapp/SingleLiveEvent.java" rel="noreferrer">here</a>.  My questions are:</p>
  
  <ol>
  <li><p>Is <code>SingleLiveData</code> is actually part of the Android Architecture Components?</p></li>
  <li><p>Is it a good idea to use it?</p></li>
  </ol>