title: Wow.js offset equal to element height
body: <p>According to the wow.js documentation I can set the bottom offset at which the animation will trigger: </p>
  
  <pre><code>  wow = new WOW(
      {
        boxClass:     'wow',      // default
        animateClass: 'animated', // default
        offset:       0,          // &lt; --------------- This one
        mobile:       true,       // default
        live:         true        // default
      }
    )
    wow.init();
  </code></pre>
  
  <p>I have a .foo container <code>&lt;div class="foo wow fadeIn"&gt;&lt;/div&gt;</code> I want to animate when its bottom hits the bottom of the viewport i.e. it is fully on my screen. So I guess the offset should be equal to the .foo element height. Is there any way to specify this in the wow.js settings above?</p>