(Springfield, OR)  --  Police say they've arrested a man who's accused of hitting a 12-year-old bicyclist with his pickup truck in Springfield.  Following the crash around 6:45 Saturday night, the boy was taken to a hospital for treatment of severe head trauma.  Authorities say 40-year-old Jeffery Kent Cantrall of Bend was arrested following the crash.  Cantrall is facing multiple charges, including assault and DUII.