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/shebang-command/index.js

@@ -0,0 +1,19 @@
+'use strict';
+var shebangRegex = require('shebang-regex');
+
+module.exports = function (str) {
+	var match = str.match(shebangRegex);
+
+	if (!match) {
+		return null;
+	}
+
+	var arr = match[0].replace(/#! ?/, '').split(' ');
+	var bin = arr[0].split('/').pop();
+	var arg = arr[1];
+
+	return (bin === 'env' ?
+		arg :
+		bin + (arg ? ' ' + arg : '')
+	);
+};