Daniel Vaughn photographs his breakfast at Snow’s BBQ in Lexington. (Photo ©Chris Wilkins/Texas BBQ Posse) We’ve got a treat for you. And since you are all — y’all — Texas barbecue fans, you are used to waiting in lines for the good stuff, right? So, wait just a little longer. Rebecca LaFlure, a Texas native, long-time barbecue fan and graduate student at Northwestern University, did a research paper recently for her  21st Century Media course on branding and how Daniel Vaughn, Texas Monthly barbecue editor, became the dominant brand in all of barbecue. You might call it, the making of a…