major linting overhaul

[daed]

I spent some time today trying to fix the linter errors so that the travis build would show up successful again.

I fixed all of the ones I knew how to, and then downgraded the others to "warnings" in the eslintrc file.

Obviously this isn't great as far as review goes because I touched a ton of files in the process, but from what I can tell, I didn't break anything.

[daed]

It looks like the node 6 test passed. Stable crashed though.

Maybe something related to this? nodejs/node#20285

[daed]

The above changes work for the tests including node 8.11.3.

Fixing this to work on node 10.7.0 is going to be a huge undertaking. The core issue here is that there are packages (gulp 3.x, dependent on vinyl-fs which is dependent on glob-watcher which is dependent on gaze which is dependent on ... until you get to an ancient version of graceful-fs) that use unsupported/undocumented things from the natives package, and in node 10 they've restricted access to a lot of the api that was exposed though that package.

There's two workarounds I've found:

• Force graceful-fs to use natives 1.1.4 via shrinkwrap. This fixes the issue in the short-term, but there's no guarantee it will continue to work in the future, because node seems to take an ill view on using natives.
• Upgrade gulp to 4. This requires changing pretty much all of the gulps, and even after I tried it, it still didn't seem to work right. It's probably the "right" way to go, but it's also the longer route and would probably take someone who knows more about what they're doing than I do.

I don't know which way is the better way to go. For my own purposes, I'll probably just do the change for natives 1.1.4 and submit a PR for it anyway.

[daed]

This needed some extra work. I managed to get the node 10 build to succeed, but I had to turn off some of the tests in the meanwhile. I'm not 100% sure whether it's the tests or the code itself that is failing, but functionality appears good in the program itself.

I need to do some more work before I'm comfortable with a PR on this.