title: jqGrid pager problem after adding a row with addRowData
body: <pre><code>var index = 'id';
  var ajaxResponse = [{id: 1, name: 'John', email: 'john@doe.co.uk'}, {id: 2, name: 'Michael', email: 'michael@example.com'}];
  $('#grid').addRowData(index, ajaxResponse);
  </code></pre>
  
  <p>After adding multiple rows one by one the pager doesn't stick to the per page limitation, also the pager reports page 1 of 0.</p>
  
  <p>After i hit the refresh button from the footer of the grid, i see the correct number of rows per page, and the correct number of pages.</p>
  
  <p>Any ideas on how to fix?</p>
  
  <p>Thanks.</p>