Couple of nodejs examples -- hello world and a slack bot

examples/nodejs/hello.js

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+
+module.exports = function(context, callback) {
+    callback(200, "Hello, world!\n");
+}

examples/nodejs/stock.js

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+'use strict';
+
+var http = require('http');
+
+module.exports = function (context, callback) {    
+    let body = context.request.body;
+    console.log(`body text: ${body['text']}`);
+
+    var symbol = body['text'].split(' ')[1];
+
+    http.get({
+        host: 'finance.google.com',
+        path: `/finance/info?q=NYSE:${symbol}`
+    }, function(response) {
+        var resp = '';
+        response.on('data', function(d) {
+            resp += d;
+        });
+        response.on('end', function() {
+
+            try {
+                var parsed = JSON.parse(resp.slice(3));
+                var lastTrade = parsed[0]['l_cur']
+                callback(200, `{ "text": "${symbol} last traded at ${lastTrade}" }`);
+            } catch (e) {
+                callback(200, `{ "text": "Error (invalid NYSE symbol?)" }`);
+            }
+        });
+    });
+
+}