- race condition in tests
- locust docs and updated values
- fix invalid cvv2 regex for Amex cards

library: Fix model annotations

Closes #33, #34, and #40

See merge request !35

Resolves #33, #34, #40

Resolves #39

Resolves #36

Resolves #38

Merges !34

# Conflicts:
#	library-management/src/main/java/cz/muni/fi/pa165/seminar3/librarymanagement/author/AuthorController.java
#	library-management/src/main/java/cz/muni/fi/pa165/seminar3/librarymanagement/book/BookController.java
#	library-management/src/main/java/cz/muni/fi/pa165/seminar3/librarymanagement/borrowing/BorrowingController.java
#	library-management/src/main/java/cz/muni/fi/pa165/seminar3/librarymanagement/fine/FineController.java
#	library-management/src/main/java/cz/muni/fi/pa165/seminar3/librarymanagement/payment/PaymentController.java
#	library-management/src/main/java/cz/muni/fi/pa165/seminar3/librarymanagement/reservation/ReservationController.java
#	library-management/src/main/java/cz/muni/fi/pa165/seminar3/librarymanagement/settings/SettingsController.java
#	library-management/src/main/java/cz/muni/fi/pa165/seminar3/librarymanagement/user/UserController.java
#	library-management/src/main/resources/application.yml

Merges !32