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/nice-try/src/index.js

@@ -0,0 +1,12 @@
+'use strict'
+
+/**
+ * Tries to execute a function and discards any error that occurs.
+ * @param {Function} fn - Function that might or might not throw an error.
+ * @returns {?*} Return-value of the function when no error occurred.
+ */
+module.exports = function(fn) {
+
+	try { return fn() } catch (e) {}
+
+}