Add auth support (#21)

* Updates

* Update

* Update

* Update

* Update

* Yarn sometimes prefers npmrc, so use same token

* Description

* Update readme

* Feedback

* Add type

* new toolkit and scoped registries

* npmrc in RUNNER_TEMP

* Dont always auth

* Try exporting blank token

* Get auth working for now pending runner changes

* Fix string interpolation for auth token.

* Don't export both userconfigs

* Update authutil.js

* Add single quotes for authString

* Fix the registry string.

* Use userconfig and append trailing slash

* Keep in root of repo

* Try just adding auth token

* Remove auth token

* Try changes again

* Add tests

* Npm and GPR samples

* Add types

node_modules/before-after-hook/lib/remove.js

@@ -0,0 +1,17 @@
+module.exports = removeHook
+
+function removeHook (state, name, method) {
+  if (!state.registry[name]) {
+    return
+  }
+
+  var index = state.registry[name]
+    .map(function (registered) { return registered.orig })
+    .indexOf(method)
+
+  if (index === -1) {
+    return
+  }
+
+  state.registry[name].splice(index, 1)
+}