title: Appcompat Toolbar "android:title" attribute not working
body: <p>I'm sure this is something very simple that I'm just overlooking. If I set the title in code it all seems to work fine:</p>
  
  <pre><code>import android.support.v7.widget.Toolbar;
  ...
  // Works fine
  Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
  toolbar.setTitle("My Title");
  </code></pre>
  
  <p>Setting it in the layout xml doesn't work:</p>
  
  <pre><code>&lt;!-- Doesn't work --&gt;
  &lt;android.support.v7.widget.Toolbar
      android:id="@+id/toolbar"
      android:layout_width="match_parent"
      android:layout_height="wrap_content"
      android:background="?attr/colorPrimary"
      android:minHeight="?attr/actionBarSize"
      android:title="@string/my_title"/&gt;
  </code></pre>
  
  <p>It's worth noting I'm using the AppCompat v7 Library and testing against android sdk version 18.</p>