This MR fixes two dependencies that rely on pre-compiled binaries which are broken in node 8:
The first one,
fsevents is bumped to a later version which works on in node 8. The second one,
node-zopfli is removed since it is apparently no longer maintained. Issue #36469 has been opened to look for a new solution for asset compression, but for now falling back to normal gzip seems like the best alternative.