title: JQuery Mobile: data-direction="reverse" not emulating initial transition
body: <p>I have a back button in my header that looks like:</p>
  
  <pre><code>&lt;a href="index.html" data-role="button" data-direction="reverse"
  data-icon="arrow-l" data-iconpos="left"&gt;Back&lt;/a&gt;
  </code></pre>
  
  <p>The transition to get to this page is <code>slide</code> and, according to the <a href="http://jquerymobile.com/demos/1.2.0/docs/pages/page-links.html" rel="nofollow">documentation</a>, adding   <code>data-direction="reverse"</code> to my back button should 'reverse' the transition that got me to that page, ie: the previous page should slide back. However, this seems to be stuck just on the default <code>fade</code> transition. Is there something I have done wrong in setting this button up? Should I have a different kind of href?</p>