Mayor Gavin Newsom says that one of his "top priorities is to ensure that every San Franciscan has a safe and happy New Year. Riding Muni is a smart and green way to ring in the new year." (Thanks, Gavin!) And with a firm flick of his wrist, this New Year's Eve, starting at 8 p.m., Muni will be free all night, which is about what it's worth. The free rides come to a......