title: jquery ajax 422 coming in as a success in chrome
body: <p>I've got a site that's using rails3, jquery-forms, and I'm testing in firefox and chome. </p>
  
  <p>For the sake of testing, I've got the server returning 422 status every time. </p>
  
  <p>When I submit my form, Firefox correctly hits "error." Chrome incorrectly hits "success." </p>
  
  <p>Anyone have any ideas why this might be the case?</p>
  
  <pre><code>$('form').ajaxSubmit({
      dataType: 'json',
      success: function(responseText, statusText, xhr, $form) {
          console.log("It hits success");         
      },
      error: function(responseText, statusText, xhr) {
              console.log("It hits failure");
      }
      });
  </code></pre>