By Alisa Boswell-Gore STILLWATER, Okla. – Oklahoma State University just kicked off its football season with a change to one of football’s biggest staples. Beer. Last month, Stillwater’s Iron Monk Brewing Company released a beer called 1890 Original, a crisp blonde ale brewed for OSU Cowboys, which is now the official craft beer offered at OSU football games. But what fans inside Boone Pickens Stadium don’t know is that the university has had…