This code comes from Chapter 1 of the book "Refactoring: Improving
the Design of Existing Code", by Martin Fowler.  It is in the state
you see at the beginning of the chapter.

2010-05-13   Ported to Ruby for 810:188 (Summer 2010)    / Eugene Wallingford
2012-10-01   Ported back to Java for CS 2530 (Fall 2012) / Eugene Wallingford

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HISTORY

v0   The original code.
v1   Decomposed the statement() method, creating helper methods
     to compute prices and frequent renter points.
v2   Moved priceFor() and frequentRenterPoints() to the Rental class.
v3   Created htmlStatement() method and tests.