Make YAML::detail::iterator_base comparison operators const (#472)
Make YAML::detail::iterator_base comparison operators const (#472)


jbeder/yaml-cpp,tangrams/yaml-cpp,dand-oss/yaml-cpp,jbeder/yaml-cpp,graehl/yaml-cpp,WrinklyNinja/yaml-cpp,graehl/yaml-cpp,loot/yaml-cpp,loot/yaml-cpp,jbeder/yaml-cpp,graehl/yaml-cpp,WaveBlocks/yaml-cpp,dand-oss/yaml-cpp,SimplyKnownAsG/yaml-cpp,graehl/yaml-cpp,WrinklyNinja/yaml-cpp,kn65op/yaml-cpp,dand-oss/yaml-cpp,jbeder/yaml-cpp,WaveBlocks/yaml-cpp,tangrams/yaml-cpp,SimplyKnownAsG/yaml-cpp,WaveBlocks/yaml-cpp,WrinklyNinja/yaml-cpp,loot/yaml-cpp,kn65op/yaml-cpp,loot/yaml-cpp,WaveBlocks/yaml-cpp,SimplyKnownAsG/yaml-cpp,tangrams/yaml-cpp,dand-oss/yaml-cpp,jbeder/yaml-cpp,SimplyKnownAsG/yaml-cpp,WrinklyNinja/yaml-cpp,tangrams/yaml-cpp,kn65op/yaml-cpp,kn65op/yaml-cpp,dand-oss/yaml-cpp,graehl/yaml-cpp