Brooklyn has yanked the welcome mat out from under Southern food chain Cracker Barrel Old Country Store due to accusations of discrimination.Borough President Marty Markowitz, who invited the company to check out Brooklyn, dropped his Southern hospitality following outrage among black and gay leaders over a history of discrimination claims against the chain."I do not believe they are ready for Brooklyn," Markowitz said yesterday."It is our greatest source of pride that Brooklyn's diversity of races, faiths and ethnicities is unrivaled anywhere in the world, and any company that is interested in doing business in Brooklyn must respect and celebrate diversity....