'adds the exits from the application'

def add_exit(self):

    self.completable.append('quit')
    self.completable.append('exit')
    self.descrip['quit'] = 'Exits    the    program'
    self.descrip['exit'] = 'Exits    the    program'
    self.command_tree.children.append(CommandBranch('quit'))
    self.command_tree.children.append(CommandBranch('exit'))
    self.command_param['quit'] = ''
    self.command_param['exit'] = ''
