scoreboard: only show matchups in current "session"
TODO: a note for future work
show_pairings: fall back on reasonable behavior if player name not available
Merge branch 'master' of github.com:jason17055/tournament

Conflicts:
	php_webapp/scoreboard-data.js.php
pairings: fill in names for players even if they aren't "ready"
pairings (interactive): begin experimenting
ratings: allow user to control weights between sessions
pairings: work on interactive pairings designer
pairings: make prettier (add person icons, change font)
ratings: adjust k value on fixed scale rather than dynamically
pairings: start playing with drag+drop