Moves isActive management to a touchCell method
Hides custom cell when semester table is dismissed
Adds alert when trying to create existing semester
Adds ModalPickerViewController class
Adds interface for ModalPickerViewController
Implements ModalPickerController
Implements ModalPickerViewController as PickerPopupView instead
Adds delegate method for notifying picker will appear
fixes setter for year
Adds new outlets for userinfo controller
changes name of nib for pickerpopupview