Loop jQuery object trough

We are using your library in a current project with RequireJS. I spontaneously used your library directly instead of jQuery as follows:

```
require(
	[
		'jquery.xdomainrequest',
	],
	function($) {
		// jQuery now present and has CORS support within IE8/IE9
	}
);
```

In the current version it does not work, because the potentially patched jQuery object isn't returned. My change does "fix" it.