add sound to notifications (implements #98)

www/js/notification.js

@@ -0,0 +1,19 @@
+/**
+ * Notification functions.
+ */
+
+/**
+ * Play notification, if audio-element is present.
+ */
+function notify()
+{
+    var notifySound = $("#notify-sound");
+    if(notifySound) {
+        notifySound.get(0).play();
+    }
+}
+
+$(function() {
+    // Play notification
+    notify();
+});