Merge pull request #187 from fcoulombe/master

Fixing the MSYS MinGW build
https://github.com/KhronosGroup/OpenCOLLADA/issues/188
https://github.com/KhronosGroup/OpenCOLLADA/issues/189
Fixing uniqueId serialization, fileId was ignored.
expose getInstanceControllerDataListMap() to get access to <skeleton>
Merge pull request #190 from KhronosGroup/fabrice-fixes

Fabrice fixes
franky removes useless code in the buildscript
franky makes the externals use the lib macro since they potentially need to also be exported with the rest of the code