Add Test for updateBook controller

    Test:
	testCannotAddCopies

    others:
	add parameter for removeAvailableCopies
Merge Commit
Refactoring test
	testAddAvailableCopiesException
Merge Commit
Add controller function and corresponding test
    controller:
	returnBook
Resolve merge conflict
	@ test/unittest/testupdateBook.py

Conflicts:
	tests/unittest/testUpdateBook.py