(This is another in a series of 30 guest columns that will run in October, when optimism reigns supreme across the NBA. The theme will be “Five Reasons to Feel Positive About … ” We encourage you to follow the authors on Twitter and visit their sites. – CS) New city. New arena. New uniforms. New team. These aren’t your New Jersey Nets anymore. When the 2012-13 NBA season tips off and you see the black-and-white-clad Brooklyn Nets playing on their new