Added arn to the main repository

arn/UserNotificationsAPI.go

@@ -0,0 +1,11 @@
+package arn
+
+// Force interface implementations
+var (
+	_ IDCollection = (*UserNotifications)(nil)
+)
+
+// Save saves the notification list in the database.
+func (list *UserNotifications) Save() {
+	DB.Set("UserNotifications", list.UserID, list)
+}