By Andrew McCarty On Saturday morning, NFL commissioner Roger Goodell sent a stern message to all 32 NFL teams. Goodell sent a memo to every team, calling lack of diversity among head coaches “unacceptable.” He said the league has made progress, but not nearly enough – especially at the coaching level. “Racism and any form of discrimination is contrary to the NFL’s values,” Goodell said in the memo. “We have made significant efforts to promote diversity and adopted numerous policies and programs which have produced positive change in many areas, however we must acknowledge that particularly wi…