additions/fixes to tournamentmode plugin

added separate game start delay for pub mode
made 5 second delay for displaying countdown string
(kTournamentModeCountdown) configurable
fixed ready reminder displaying during pub mode
fixed lastpubmessage and kTournamentModePubAlertDelay always being nil
and causing scoreboard issues
Merge pull request #25 from pkormendi/master

tournamentmode plugin additions/fixes