title: Espresso: How to do custom swipe e.g. swipeTop or swipeBottom
body: <p>So far we can do:</p>
  
  <ul>
  <li>swipeLeft    </li>
  <li>swipeRight    </li>
  <li>swipeUp    </li>
  <li>swipeDown</li>
  </ul>
  
  <p>How can we swipeTop(all the way to the Top) or swipeBottom(all the way to the bottom) is expresso. Please give me an example if these methods already exists.</p>