bugfix: Don't try to export if a root geometry wasn't created
Updated pngs after merging unstable
Mac fix: Only use NSLog when GUI launched
Issue #582 was fixed sometime during the unstable branch refactoring
#593 was fixed by #608
#541 was fixed during unstable refactoring
CGAL-4.4 fixed some issues
Correction: It wasn't fixed in CGAL after all, it was fixed somewhere in our code
Merge branch 'master' into issue350
Fix handling of examples folder (fixes #795).
Merge pull request #798 from openscad/win-installer-fix

Fix handling of examples folder (fixes #795).
#791 Handle twist=0 as no twist
Merge branch 'master' of github.com:openscad/openscad
bugfix: Empty import combined with real geometry caused an assert failure
Merge branch 'master' into issue350

Conflicts:
	tests/regression/dumptest/linear_extrude-scale-zero-tests-expected.csg
	tests/regression/dumptest/use-tests-expected.csg
bugfix: Empty surface() shouldn't generate any geometry. Temporarily disabled tests returning error code 1
Make lazy-union an experimental feature
Fixed memory issue; double delete due to two separate shared_ptr pointing to the same object