Steve DeShazo of Fredricksburg.com takes a look at the Nats slow burning fire sale, the Nats have quietly turned their roster over and it appears they're not done yet.DeShazo believes the only player who is untouchable is Ryan Zimmerman. In addressing Nick Johnson, DeShazo speculates that Boston and the Mets could be a fit. He also believes that Adam Dunn can be had but the price will have to be right, Dunn is not a rental player he signed a two year deal...First baseman Nick Johnson (one...