liivur/Ryhm1 — pull request #29 by tsudmi (2014-10-26 14:07:29+00:00)
Title: Task 2.2

Subtasks:
- Add an additional column "Sum" to the "Shopping Cart" table, where the total sum for the product will be calculated. (Price * Amount).
- Prohibit adding the product to the shopping cart once the warehouse has no more items. The user must be notified about it with a warning message.