Disabled some tests for Travis which fails due to Gallium 0.4 driver issues on Ubuntu 12.04
#915 Make QScintilla editor the default
#904 testcase
Only print one degenerate triangle warning per polyset
Added expected files for #904
#337 Print warning on non-simple export instead of refusing to export
Add --render=cgal option for test purposes (forces conversion to CGAL Nef polyhedron before rendering
Use --render=cgal in export-import tests, added testcase for #936