In case you haven’t already found out about how Slash got snubbed by Dr. Pepper as part of the drink manufacturer’s recent “Chinese Democracy” promotion, I’m gonna give you a little heads up just so you know what I’m talking about. Dr. Pepper has vowed to give everyone in the U.S. a free can of the drink if Guns N’ Roses’ long-awaited new album, “Chinese Democracy”, is released this year. Everyone, that is, apart from…