Card.py is now 100% covered by test cases.

Jerome-2:CardsForTheWorkingMathematician jerome$ coverage report -m
Name    Stmts   Miss  Cover   Missing
-------------------------------------
card      150      2    99%   68-69
Jerome-2:CardsForTheWorkingMathematician jerome$ coverage run card.py
.........
----------------------------------------------------------------------
Ran 9 tests in 0.002s

OK
Jerome-2:CardsForTheWorkingMathematician jerome$ coverage report -m
Name    Stmts   Miss  Cover   Missing
-------------------------------------
card      150      0   100%
Ignoring the outputs of coverage.py