[chapter 01] initial example with spec
[chapter 01 #8] extract method Customer#amount_for
[chapter 01 #11] rename variables
[chapter 01 #12] move method Customer#amount_for to Rental#charge
[chapter 01 #12] Replace Temp with Query
[chapter 01 #18] extracting frequent renter points
[chapter 01 #22] removing temps with query, so we can reuse calculations in Customer#html_statement
[chapter 01 #33] move methods because the proposed changes all about adding types, so calculation should be in movie
[chapter 01 #36] Replace Type Code with State/Strategy
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