Scheduler to check orders, alert users and send email about luncher

[artem-karpenko]

There should be two kinds of scheduled jobs:

1. job that runs each evening (17:00?) except Friday and checks whether there were changes in this week's orders; if there are any - (re)send email; this check can be performed by using flag that is set when user changes his orders in the system;

2. job that starts on Friday (from 11:00?) and every hour checks if each user has saved his orders for the next week (at least empty). If user has not - send him email with reminder. On Friday's evening (17:00?) email is sent with the orders for the next week. Starting from Saturday the job no. 1 starts to work.