Updates to host coordinator:

- every time we check for the host's existence, if the host doesn't exist
  or abandoned the game, the client will try to claim their role automatically
- unified both event types into one "host changed" event
- fixed bug that ignored negative player ids



git-svn-id: svn+ssh://src.earth.threerings.net/vilya/trunk@218 c613c5cb-e716-0410-b11b-feb51c14d237

src/as/com/threerings/ezgame/EZGameControl.as

@@ -412,7 +412,7 @@ public class EZGameControl extends BaseControl
      * Get the display name of the specified occupant.
      * Two players may have the same name: always use playerId to
      * purposes of identification and comparison. The name is for display
-     * only.
+     * only. Will be null is the specified playerId is not in the game.
      */
     public function getOccupantName (playerId :int) :String
     {