Mac: Give document windows proper proxy icons
Add Mac standard Cmd-D shortcut for the 'Don't Save' button
Preserves undo status if using the internal editor together with 'autoreload and compile'
Merge pull request #780 from OskarLinde/discard-shortcut

Add Mac standard Cmd-D shortcut for the 'Don't Save' button
#252 Downgrade to Qt-5.2.0 for Mac
Merge branch 'proxy-icons' of git://github.com/OskarLinde/openscad into OskarLinde-proxy-icons
Merge branch 'OskarLinde-proxy-icons'
Merge pull request #788 from OskarLinde/autoreload_undo_fix

auto-reload & compile with internal editor preserve undo status