Since we last left them, the Nationals have won four of their last five games. They no longer possess the worst record in the league (thank you, Texas). Nationals attendance is also rising, and they are poised to break an average of 30,000 fans a game. Also, Wily Mo Pena has received his World Series ring! All is not puppies and sunshine for the Nats, though. First, closer Chad Cordero felt his arm go out…