added unit testing, and started implementing unit tests...phew

node_modules/p-finally/index.js

@@ -0,0 +1,15 @@
+'use strict';
+module.exports = (promise, onFinally) => {
+	onFinally = onFinally || (() => {});
+
+	return promise.then(
+		val => new Promise(resolve => {
+			resolve(onFinally());
+		}).then(() => val),
+		err => new Promise(resolve => {
+			resolve(onFinally());
+		}).then(() => {
+			throw err;
+		})
+	);
+};