title: Poltergeist - turning off JQMIGRATE warnings
body: <p>When running my test suite using poltergeist as the JavaScript driver, I am encountering the following warnings:</p>
  
  <pre><code>JQMIGRATE: jQuery.fn.attr(selected) may use property instead of attribute
  JQMIGRATE: jQuery.browser is deprecated
  </code></pre>
  
  <p>Is that possible to turn them off?</p>