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/get-stream/buffer-stream.js

@@ -0,0 +1,51 @@
+'use strict';
+const {PassThrough} = require('stream');
+
+module.exports = options => {
+	options = Object.assign({}, options);
+
+	const {array} = options;
+	let {encoding} = options;
+	const buffer = encoding === 'buffer';
+	let objectMode = false;
+
+	if (array) {
+		objectMode = !(encoding || buffer);
+	} else {
+		encoding = encoding || 'utf8';
+	}
+
+	if (buffer) {
+		encoding = null;
+	}
+
+	let len = 0;
+	const ret = [];
+	const stream = new PassThrough({objectMode});
+
+	if (encoding) {
+		stream.setEncoding(encoding);
+	}
+
+	stream.on('data', chunk => {
+		ret.push(chunk);
+
+		if (objectMode) {
+			len = ret.length;
+		} else {
+			len += chunk.length;
+		}
+	});
+
+	stream.getBufferedValue = () => {
+		if (array) {
+			return ret;
+		}
+
+		return buffer ? Buffer.concat(ret, len) : ret.join('');
+	};
+
+	stream.getBufferedLength = () => len;
+
+	return stream;
+};