add 'resetdeps' script target

As we move around branches with the CLI, it's possible to occasionally
end up in a state where the node_modules folder has some things in the
wrong places as we self-hoist.  This command lets us do 'npm run
resetdeps' to get back to a consistent state.

package.json

@@ -289,7 +289,8 @@
     "eslint": "eslint",
     "lint": "npm run eslint -- \"lib/**/*.js\"",
     "lintfix": "npm run lint -- --fix",
-    "prelint": "rimraf test/npm_cache*"
+    "prelint": "rimraf test/npm_cache*",
+    "resetdeps": "rm -rf node_modules && git checkout node_modules && node . i --ignore-scripts --no-audit && node scripts/bundle-and-gitignore-deps.js"
   },
   "//": [
     "XXX temporarily only run unit tests while v7 beta is in progress",