Merge remote-tracking branch 'upstream/master'
With the usage of GLFW on Linux, Xrandr library is required
Initial port of CMake macro for test on Ubuntu
Merge branch 'master' of https://github.com/nyue/openvdb_dev
Port to OS X
Python module is build in the main CMake configuration
Fix python related files installation
Tried to implement Doxygen stuff
Comment out the installation of documentation as it cannot be
generated at the moment
Port to Windows
Merge branch 'nyue-master'

Conflicts:
	openvdb/CMakeLists.txt   -- solved, merged  houdini lib fixes...  need to test