title: Robolectic in Android with V7 support library issue
body: <p>Previously I was uising <code>ShadowAlertDialog.getLatestAlertDialog()</code> to test AlertDialog using Robolectric. However, I have updated my UI and now I am using V7 support library. So, it is giving me incompatible types error. </p>
  
  <pre><code>  Error:(82, 50) error: incompatible types
  required: android.support.v7.app.AlertDialog
  found:    android.app.AlertDialog
  </code></pre>
  
  <p>is there any solution to resolve this issue?</p>