Merge remote-tracking branch 'origin/7-add-put-restaurant' into 7-add…

…-put-restaurant

# Conflicts:
#	backend/src/main/java/com/neuefische/team2/backend/restaurant/RestaurantController.java
#	backend/src/main/java/com/neuefische/team2/backend/restaurant/RestaurantService.java
#	backend/src/main/java/com/neuefische/team2/backend/restaurant/domain/NewRestaurantDTO.java
#	backend/src/main/java/com/neuefische/team2/backend/restaurant/domain/Restaurant.java
#	backend/src/test/java/com/neuefische/team2/backend/restaurant/RestaurantControllerIntegrationTest.java
#	backend/src/test/java/com/neuefische/team2/backend/restaurant/RestaurantServiceTest.java