title: android.support.v7.widget.CardView could not be found (Android Studio 1.1 Preview)
body: <p><img src="https://i.stack.imgur.com/GfCQb.png" alt="enter image description here"></p>
  
  <p>I'm trying to add CardView to my activity as the official sample. But it doesn't work.</p>
  
  <p>If I run my project directly, it would lead to java.lang.ClassNotFoundException: android.support.v7.widget.CardView .</p>