title: SwipeRefreshLayout in both directions?
body: <p>I love the new SwipeRefreshLayout! It looks great and its quite easy to use.
  But i want to use it in both directions. I have a message screen and i want to 
  load older messages by swiping from top to bottom and i want to load newer messages by swiping from bottom to top.</p>
  
  <p>This example: <a href="http://www.bignerdranch.com/blog/implementing-swipe-to-refresh/" rel="nofollow">http://www.bignerdranch.com/blog/implementing-swipe-to-refresh/</a>
  explained quite easily how to get the top to bottom swiping but how can i implement that for both directions?</p>