Add ".es" to recognised ECMAScript extensions

* Add ".es" to recognised JavaScript extensions
* Add heuristic to differentiate Erlang from ECMAScript
* Add test-case for .es heuristic

samples/JavaScript/axios.es

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+import axios from "axios";
+
+export default {
+	async getIndex(prefix) {
+		const {data} = await axios.get((prefix || "") + "/index.json");
+		return data;
+	},
+	
+	async getContent(path, prefix) {
+		const {data} = await axios.get((prefix || "") + "/" + path + ".json");
+		return data;
+	}
+}

samples/JavaScript/index.es

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+import config from "../webpack.config";
+import webpackDevMiddleware from "webpack-dev-middleware";
+import webpackHot from "webpack-hot-middleware";
+import webpack from "webpack";
+import express from "express";
+
+app.use(webpackDevMiddleware(compiler, {
+	noInfo: false,
+	quiet: false,
+	publicPath: config.output.publicPath,
+	hot: true,
+	historyApiFallback: true
+}));
+	
+app.get("/(:root).json", (req, resp) => {
+	resp.send(indexer.index(req.params.root));
+});
+
+export default function(){
+	const server = http.createServer(app);
+	
+	server.listen(3000);
+	
+	const wss = new WebSocketServer({server});
+	
+	let id = 1;
+	wss.on("connection", (ws) => {
+		console.log("Hello", " world");
+		let wsId = id++;
+		sessions[wsId] = ws;
+		ws.on("close", () => {
+			delete sessions[wsId]
+		});
+	});
+};