Ch8 - Update test to reflect desired Dollar factory method

Chapter 8: Makin' Objects, page 36
Ch8 - Add Dollar factory method to Money

Chapter 8: Makin' Objects, page 36
Ch8 - Update tests to use Dollar factory method

Chapter 8: Makin' Objects, page 37
Ch8 - Update tests to use Franc factory method

Chapter 8: Makin' Objects, page 37
Ch8 - Add Franc factory method to Money

Chapter 8: Makin' Objects, page 37