Updated the ostream emitting overload to user the new ostream-handling emitters
Updated the ostream emitting overload to user the new ostream-handling emitters

bassosimone/yaml-cpp,bassosimone/yaml-cpp,bassosimone/yaml-cpp,steinwurf/yaml-cpp,bassosimone/yaml-cpp,steinwurf/yaml-cpp,steinwurf/yaml-cpp,steinwurf/yaml-cpp