docs: def input_yes_no(msg=''):
      """
      Simple helper function
      """
      print '\n'+msg
      while(True):
          i=raw_input('Input yes or no: ')
          i=i.lower()
          if i=='y' or i=='yes':
              return True
          elif i=='n' or i=='no':
              return False
          else:
              print 'ERROR: Bad input. Must enter y/n/yes/no'