title: Changing BottomNavigationView's Icon Size
body: <p>I have been experimenting with the new BottomNavigationView and trying to customise it.</p>
  
  <p>So far I have managed to change the height and margins by using the below:</p>
  
  <pre><code>&lt;dimen name="design_bottom_navigation_height" tools:override="true"&gt;75dp&lt;/dimen&gt;
  &lt;dimen name="design_bottom_navigation_margin" tools:override="true"&gt;5dp&lt;/dimen&gt;
  </code></pre>
  
  <p>I want to increase the size of the icons.</p>
  
  <p>How can this be done?</p>
  
  <p>Compile Version: com.android.support:design:25.0.1</p>