Avoid event during registration

Registration gets very slow if the follow tag event  is triggered. During registration several objects are created (like widgets) which all trigger this event. Large user databases it will devastate performance of the registration process.

start.php

@@ -64,8 +64,9 @@ function follow_tags_init() {
 	elgg_extend_view('js/elgg','js/follow_tags/site');
 
 	// Run the followtags_notofy function in event is triggerd
-	elgg_register_event_handler('create', 'object', 'follow_tags_notify', 501);
-
+	if (elgg_is_logged_in()) {
+		elgg_register_event_handler('create', 'object', 'follow_tags_notify', 501);
+	}
 }
 
 function follow_tags_data_page_handler() {