[lint demo] Hot-link another version of csslint.js

Closes #3791

demo/lint.html

@@ -11,7 +11,7 @@
 <script src="../mode/css/css.js"></script>
 <script src="//ajax.aspnetcdn.com/ajax/jshint/r07/jshint.js"></script>
 <script src="https://rawgithub.com/zaach/jsonlint/79b553fb65c192add9066da64043458981b3972b/lib/jsonlint.js"></script>
-<script src="https://rawgithub.com/stubbornella/csslint/master/release/csslint.js"></script>
+<script src="http://csslint.net/js/csslint.js"></script>
 <script src="../addon/lint/lint.js"></script>
 <script src="../addon/lint/javascript-lint.js"></script>
 <script src="../addon/lint/json-lint.js"></script>