This extends the behavior of Aoe_JsCssTstamp to also version files that are added through addJs instead of addItem, in both the frontend as well as the backend.
Example before;
<script type="text/javascript" src="https://www.example.com/js/prototype/prototype.js"></script>
Example after;
<script type="text/javascript" src="https://www.example.com/js/prototype/prototype.1478599408.js"></script>