Update jquery/jquery-url.js

Wrap jQuery plugin in anonymous function and pass jQuery object. This makes it compatible with jQuery.noConflict(); and makes it easier to manage in outlying situations where jQuery is not part of the global namespace, such as when bound to unsafeWindow in the case of userscripts.
Merge pull request #13 from QWp6t/patch-1

make jQuery plugin compatible with jQuery.noConflict();