deps: upgrade to npm 2.14.4

Heyo!

This release is the first one to officially include node-gyp (@3.0.1), so it shouldn't need any hotfixes cherry-picked over! Otherwise, I can add a commit to this that bumps it to @3.0.3 (which will come in with next week's downstreaming anyway).

This also includes most of @thefourtheye's graceful-fs upgrades, a Windows fix for npm link, and a removal of our only usage of a deprecated API (process.binding).

You can see the full release notes at https://github.com/npm/npm/releases/tag/v2.14.4

lmk if you want that node-gyp patch added to this PR!

Also note that we finally released npm@3 this week (as you may have heard), but I'll continue to submit npm@2 release PRs -- you can expect a potential slowing, though, since we're also switching to LTS more with npm@2, so it won't see very much in terms of new features and such.

Cheers!