We should be removing ourselves from our parent when we're finished.

git-svn-id: svn+ssh://src.earth.threerings.net/nenya/trunk@225 ed5b42cb-e716-0410-a449-f6a68f950b19

src/as/com/threerings/flash/FloatingTextAnimation.as

@@ -69,6 +69,7 @@ public class FloatingTextAnimation extends Sprite
         var perc :Number = elapsed / duration;
         if (perc >= 1) {
             AnimationManager.removeDisplayAnimation(this);
+            parent.removeChild(this);
             return;
         }