Review: YAML serialization

Malcolm Humphreys <malcolmh...@...>

- Initial checkin of YAML serialization
- Added ext/yaml-cpp-0.2.5.tar.gz with a patch to build it static
- Added yaml-cpp to the LICENCE file
- CDLTransform should be the only thing depending on tinyxml
- PyOCIO_Config_getXML now returns YAML not XML, this should be fixed soon. Possibly this python method should be removed and we use the config.__str__() instead, this would make it slightly more pythonic


Join to automatically receive all group messages.