Test.

Added a test for high-card but also modified the return value
in the test. In order to figure out which hand has the highest
score, I'm going to have to return an explicit score as well.
Implementation.

I reversed the list *values* so that the higher cards get a
higher score. Also updated the calculation of the score so
that it takes the length of the (member card *values) + 1 and
divides it by 4 and rounds upwards. That way. All the cards
of the same rank should get the same score regardless of which
suit they're in.
Test.

Apparently my clever score calculation code doesn't work. AH
and AS should get the same score, but they don't.