title: Not able to use Google Play Services library in Android Studio
body: <p>Moving to Android Studio, I'm no more able to add and use the Google Play Servies Library.</p>
  
  <p>I create a simple project, I add the library as module, the sign-in button in my layout but when I run the app crashes because of ClassNotFoundException...</p>
  
  <p>Anyone with the same problem?</p>