title: Custom layout for Fading ActionBar Lib
body: <p>I'm using Fading action bar library in my activity but i can't find a way to set a custom layout to the action bar .i can only set a drawable to my action bar in this library, i tried looking inside libraries code but it didn't help so much ............ is there anyway to do that. </p>
  
  <p>here is how it usually works :</p>
  
  <pre><code>         FadingActionBarHelper helper = new FadingActionBarHelper()
          .actionBarBackground(R.drawable.ab_background)
          .headerLayout(R.layout.header)
          .contentLayout(R.layout.activity_profile);
  </code></pre>