Sorted out extra load

turns out we were never exiting the loop even when all bots left. Games now
shut down when there ever has been bots and they all leave (or are killed,
I think).

game.go

@@ -37,7 +37,7 @@ func NewGame(id string, width, height float64) *game {
 		spectators:  make(map[*Spectator]bool),
 		sregister:   make(chan *Spectator),
 		sunregister: make(chan *Spectator),
-		kill:        make(chan bool),
+		kill:        make(chan bool, 128),
 	}
 
 	g.robot_id = make(chan int)
@@ -52,13 +52,18 @@ func NewGame(id string, width, height float64) *game {
 }
 
 func (g *game) run() {
+	started := false
 	for {
 		select {
 		case <-g.kill:
-			log.Printf("%s: received kill signal, dying gracefully", g.id)
+			log.Printf("game %s: received kill signal, dying gracefully", g.id)
+			gameLock.Lock()
+			delete(games, g.id)
+			gameLock.Unlock()
 			return
 		case p := <-g.register:
 			g.players[p] = true
+			started = true
 		case p := <-g.unregister:
 			delete(g.players, p)
 			close(p.send)
@@ -68,6 +73,10 @@ func (g *game) run() {
 			delete(g.spectators, s)
 			close(s.send)
 		case <-time.Tick(time.Duration(*tick) * time.Millisecond):
+			if started && len(g.players) == 0 {
+				g.kill <- true
+			}
+
 			g.turn++
 			t0 := time.Now()