title: X-Editable - Submit old value
body: <p>Well I'm using the X-Editable and wanted to know if it's possible to submit the new value and the old one. For instance, the field has "Portugal". Using the X-Editable inline I change it to "Spain". In the AJAX Request I want to send the primary key, the old and the new value in order to validate if the value was changed by someone else when querying the database. Is this possible and I'm missing some part of the documentation or not?</p>
  
  <p>Cheers.</p>