Fix Win32 build
Fixing the linking of the tests on the Lugano cluster (missing boost::program_options symbols).
CMake external bump (nullptr OS X fix)
Merge branch 'master' of https://github.com/eile/Collage
CMake external bump (clangcheck target fix)
CMake external bump (clangcheck target fix)
Merge branch 'master' of https://github.com/eile/Collage

Conflicts:
	.gitexternals
Merge branch 'master' of https://github.com/Eyescale/Collage