Opponents expected to mount legal challenge, protests
                                
                                
                                    (Newser) -
                                    A week after  New Zealand musically ushered in  gay marriage, France has become planet Earth's 14th nation to legalize same-sex unions. The measure passed today, 331-225, in the National Assembly following weeks of  massive and crippling protests  against it, reports the  BBC , and President Francois Hollande is set to...