By THOMAS PEIPERT COLORADO SPRINGS, Colo. (AP) — A man who fatally shot six people at a Colorado birthday party before killing himself was upset after not being invited to the weekend gathering thrown by his girlfriend’s family, police said Tuesday, calling the shooting an act of domestic violence. The shooter, 28-year-old Teodoro Macias, had been in a relationship with one of the victims, 28-year-old