first pass at fully functional test infrastructure to work with travis ci

tests/apps/nodejs-express/Procfile

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+web: bin/node web.js

tests/apps/nodejs-express/check_deploy

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+#!/bin/bash
+set -e
+test "$(curl $1)" == "nodejs/express2"

tests/apps/nodejs-express/package.json

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+{
+  "name": "node-example",
+  "version": "0.0.1",
+  "dependencies": {
+    "express": "2.5.x"
+  },
+  "engines": {
+    "node": "0.8.x",
+    "npm": "1.1.x"
+  }
+}

tests/apps/nodejs-express/web.js

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+var express = require('express');
+
+var app = express.createServer(express.logger());
+
+app.get('/', function(request, response) {
+  response.send('nodejs/express');
+});
+
+var port = process.env.PORT || 5000;
+app.listen(port, function() {
+  console.log("Listening on " + port);
+});