[npm] install deps "global-style" (#9166)

Backports PR #9136

**Commit 1:**
[npm] install deps "global-sytle"

Installing dependencies "global-style" creates a top-level directory in `node_modules` for each direct dependency, and then creates a flat tree of dependencies inside each of those.

I prefer this method because it prevents accidentally depending on a dependency of a dependency, and makes it easier to find dependencies in `node_modules`.

Unfortunately the `node_modules` directory will be a little deeper.

* Original sha: 95103f0
* Authored by Spencer <[email protected]> on 2016-11-18T16:43:54Z
* Committed by GitHub <[email protected]> on 2016-11-18T16:43:54Z

.npmrc

@@ -1 +1,2 @@
 save-exact=true
+global-style=true