Getty It only takes a handful of fans at any college football game to put a stain on the entire crowd. What’s happened the last two times the Colorado Buffaloes have played a home game isn’t an indictment of all CU fans, but there’s an uncomfortable pattern developing that the school and the program are trying to get out in front of. The school is adding extra security at the Buffs remaining two home games to monitor fan behavior. CU hosts Arizona on Saturday. Issue at Colorado began with visit