title: React Native ScrollView is not scrolling to the bottom sometimes
body: <p>inside my application index.io.js there is only 1 <code>ScrollView</code> that is wrapped inside a <code>View</code> under the <code>render</code> function. Sometimes I can scroll to the very bottom of the ScrollView and keep the screen there. However the ScrollView would bounce back to the top of the screen and fail to stay at the bottom sometimes.</p>
  
  <p>Does anyone know what is happening? Thanks. </p>
  
  <pre><code>render() {
    return &lt;View style={{flex: 1}}&gt;
    &lt;ScrollView&gt;
      &lt;Text&gt;234&lt;/Text&gt;
      &lt;Text&gt;234&lt;/Text&gt;
      &lt;Text&gt;234&lt;/Text&gt;
      &lt;Text&gt;234&lt;/Text&gt;
      // .... repeat so many times ...
    &lt;/ScrollView&gt;
    &lt;/View&gt;
  }
  </code></pre>
  
  <p>p.s: my RN is 0.28.0, iOS deployment target is 8.0 </p>