Sunset the Nuke 6 builds
Added Linux builds for 3.1.1
Update the Mac builds
Goodbye Nuke 6
Ignore .a
Bye
Goodbye Nuke6 quicktest
Add Sebastian to the README
Merge the Nuke7 build of 311
Merge all the new 311 builds and remove Nuke 6
Note that we use GH releases now
Merge master
Rewrite FindNuke.cmake to automatically find Nuke on Windows (if installed in the standard location. See todos at beginning of file.