Fix for issue #70: support yaml-cpp 0.5+ (new api).
Fix some warnings.
Fix Iterator + FindValue for yaml-cpp 0.5 (fix #70).
Merge pull request #81 from bchretien/fix-70

Fix #70
Merge pull request #72 from ros-planning/fix-70

Fix for issue #70: support yaml-cpp 0.5+ (new api).