Updated "rank" and "top" commands.

"top" command now only outputs up to 10 players at a time. Both "rank" and
"top" commands take advantage of PlayerRecord comparators where possible.
"winrate" is now available as a stat for "top" and "rank" commands for
TexasTourney. Changed equals() to equalsIgnoreCase() for string
comparisons in those two commands (issue #137).