Finished AssignmentEditController.
Fixed initialization of AssignmentCreator in AssignmentAddController.
Added comments to AssignmentEditController.
Finished AssignmentEditor constructor
Removed duplicate lines in initUI() that should be in layoutUI()
Fixed typo in layoutUI()
One last typo
layoutUI() changed to add mainPanel and buttonPanel to content pane instead of the frame itself
Switched buttonPanel's layout from FlowLayout to BoxLayout(x axis)
Finished layoutUI()