Fix "explicit instantiation of 'Eigen::Spline' must occur in namespace 'Eigen'" warnings
Fix "explicit instantiation of 'Eigen::Spline' must occur in namespace 'Eigen'" warnings

madlib/eigen_backup,mjbshaw/Eigen,rotorliu/eigen,madlib/eigen_backup,madlib/eigen_backup,mjbshaw/Eigen,mjbshaw/Eigen,rotorliu/eigen,rotorliu/eigen,mjbshaw/Eigen,madlib/eigen_backup,rotorliu/eigen