title: Toolbar image centered
body: <p>Using the last <code>android.support.v7.widget.Toolbar</code> I want to center an image in the toolbar but it keeps staying on the left.</p>
  
  <p>The best way for me would be to use <code>toolbar.setLogo()</code> method and to center the logo but i don't see any way to do it.</p>
  
  <p>I use a layout for the <code>Toolbar</code>:</p>
  
  <pre><code>  &lt;android.support.v7.widget.Toolbar style="@style/ToolBarStyle"
                                     xmlns:android="http://schemas.android.com/apk/res/android"
                                     android:layout_width="match_parent"
                                     android:layout_height="wrap_content"
                                     android:background="?attr/colorPrimary"
                                     android:minHeight="@dimen/abc_action_bar_default_height_material"&gt;
  
  &lt;/android.support.v7.widget.Toolbar&gt;
  </code></pre>
  
  <p>Is there any possibility to add an image (logo) to the toolbar and center it?
  programatically or in the layout?</p>