title: SimplePager row count is working incorrectly
body: <p>I'm using <code>SimplePager</code> and I want to show 12 items (users) per page. My entire data set is 20 items.</p>
  
  <p>The problem is that the first page (correctly) shows items 1-12, but the second page shows items 9-20. I want the second page to show items 13-20.</p>
  
  <p>What's going wrong?</p>
  
  <p>Here is my code:</p>
  
  <pre><code>CellTable&lt;User&gt; cellTable = new CellTable&lt;User&gt;();
  
  SimplePager pager = new SimplePager(TextLocation.CENTER);      
  pager.setDisplay(cellTable);    
  pager.setPageSize(12);
  
  
  ListDataProvider&lt;User&gt; dataProvider = new ListDataProvider&lt;User&gt;();&lt;br&gt;
  dataProvider.setList(USERSList);  
  dataProvider.addDataDisplay(cellTable);
  </code></pre>
  
  <p>Thank you in advance!</p>