Add possibility to fetch calendars through socket notifications

modules/default/calendar/calendar.js

@@ -133,6 +133,10 @@ Module.register("calendar", {
 
 	// Override socket notification handler.
 	socketNotificationReceived: function (notification, payload) {
+		if (notification === "FETCH_CALENDAR") {
+			this.sendSocketNotification(notification, {"url": payload.url, "id": this.identifier})
+		}
+		
 		if (this.identifier !== payload.id) {
 			return;
 		}