#14 Add log_name filter

[Nobody/Anonymous]

Breakdown kills, etc by log_name, and then allow users
to filter their stats by log_name.

So, if you had a log file that was just the matches
between 2 teams, you could name it team1_vs_team2.log
or something similar, parse it, and then the logger
would be able to show kills/deaths only for that log.