add Booking, BookingList, BookingRoom, BookingRoomList
select a booking at a time, assign room each by each
Revert "add Booking, BookingList, BookingRoom, BookingRoomList"

This reverts commit f2641f08fecc4bd612264e006304596786785b50.
Cannot load JDBC driver class 'org.apache.derby.jdbc.ClientDriver'
Error when try to connect database.
solve errors: 'back to select booking room' button take you to continue assigning booking room, after complete assign room function successfully
complete project part of assign room
add 'back to...' buttons on every page, going up to parent page of choices
'logout' button on 'check_booking.jsp' to log out reception manager, session is invalided.
solve the error of reverting
Merge branch 'origin/master'

Conflicts:
	WebContent/WEB-INF/web.xml
	WebContent/customer.jsp
	src/model/Booking.java
	src/model/BookingList.java
	src/model/RoomManager.java
Merge branch 'origin/ReceptionManager'
solve merge issue with reception manager