A couple of enhancements

I've added a `do_action()` call at the point that the plugin has loaded, so that other plugins and themes know when this plugin is present and loaded. Useful in the case where the front-end links need to be removed from the comment text and placed elsewhere.

Also, the particular system I work with has an AJAX commenting system, so I have refactored the javascript so that the click bindings can be reapplied when new comments are fetched and inserted in the DOM.

Cheers for maintaining this useful plugin.

Christian