Inspired by everybody's awesome work getting the 3D extension live, I spent some time yesterday making some tweaks, including working with Hashar to get continuous integration testing working for the 3d2png tool. :)

Review on the patches would be welcome!

3d2png:

* https://gerrit.wikimedia.org/r/#/c/413182/ - fix for test on node 7+

* https://gerrit.wikimedia.org/r/#/c/413183/ - fix for test loading files before they're completely written

* https://gerrit.wikimedia.org/r/#/c/413184/ - update reference rendering to match current code

* https://gerrit.wikimedia.org/r/#/c/413277/ - fix for Linux to run 'npm test' internals through xvfb-run, add mesa libs to debian package description

* https://gerrit.wikimedia.org/r/#/c/413344/ - cleaner error throw in case GL doesn't initialize

Hashar has already merged the configuration changes to CI and confirmed it now runs correctly with these patches in; we can take it out of experimental mode once these are merged.

I also noticed that upload.wikimedia.org serves the .stl files uncompressed; gzipping would cut bandwidth usage and thus transfer time approximately in half.

Patch to main puppet config which I think will resolve this:

* https://gerrit.wikimedia.org/r/#/c/413236/ - apply gzip for application/sla files

-- brion