Refactored code and added commit method

- All loadMethods have been refactored
- commit method has been added to class
- Deleted ArrayList deletedCustomers
- Deleted registerDeletedCustomer method

Reviewed by: Christoper
JavaDocs made, class refactored

- All methods have been refactored
- All methods ready to use, except findBookingByParams
- JavaDocs created for all methods

Reviewed by: Christopher
Mapper changes

Adde functionality to booking mapper, and customer mapper, as well as
minor variable type changes to the customer class.
refactor uow

Refactored uow commit method, by renaming methods.
still conflicts in casablanca GUI

	Need to be fixed by robert
	Reviewed by: Go5