Update to use express for heroku reviews app

Procfile

@@ -0,0 +1 @@
+web: npm run start:express

package.json

@@ -4,8 +4,8 @@
   "version": "0.1.0",
   "description": "terra-core",
   "engines": {
-     "node": "6.9.4"
-   },
+    "node": "6.9.4"
+  },
   "repository": {
     "type": "git",
     "url": "git+https://github.com/cerner/terra-core.git"
@@ -42,6 +42,7 @@
     "clean:install": "npm run clean:all && npm install",
     "clean:obsolete-snapshots": "npm test -- -u",
     "compile": "lerna run compile",
+    "compile:prod": "cd packages/terra-site && npm run compile:prod",
     "deploy": "lerna run --scope terra-site deploy",
     "heroku-prebuild": "npm install -g [email protected]",
     "heroku-postbuild": "npm install --only=dev",
@@ -54,6 +55,7 @@
     "pretest": "npm run lint",
     "postinstall": "npm run bootstrap",
     "start": "cd packages/terra-site && npm run start",
+    "start:express": "node scripts/express/app.js",
     "test": "npm run jest && npm run test:nightwatch-default",
     "test:nightwatch-default": "node ./packages/terra-toolkit/lib/scripts/nightwatch-process.js --env default-tiny,default-small,default-medium,default-large,default-huge,default-enormous"
   },
@@ -72,6 +74,7 @@
     "eslint-plugin-import": "^2.2.0",
     "eslint-plugin-jsx-a11y": "^3.0.2",
     "eslint-plugin-react": "^6.9.0",
+    "express": "^4.15.2",
     "glob": "^7.1.1",
     "husky": "^0.13.1",
     "identity-obj-proxy": "^3.0.0",

scripts/express/app.js

@@ -0,0 +1,29 @@
+/* eslint-disable import/no-extraneous-dependencies */
+/* eslint-disable no-console */
+const express = require('express');
+const path = require('path');
+const shell = require('shelljs');
+
+const app = express();
+const port = process.env.PORT || 8081;
+// npm script to build assets by webpack
+const buildCommand = 'npm run compile:prod';
+// path to webpack built path
+const buildPath = path.join(__dirname, '../../packages/terra-site/build');
+
+// listen to PORT to avoid Heroku error: R10 boot timeout
+app.listen(port);
+console.log(`Listening ${port}`);
+
+if (!shell.test('-d', buildPath)) {
+  if (shell.exec(buildCommand).code !== 0) {
+    console.log(`Errors in command: ${buildCommand}`);
+    process.exit(1);
+  } else {
+    console.log(`Finished command: ${buildCommand}`);
+  }
+}
+
+app.use('/static', express.static(buildPath));
+app.get('/', (req, res) => res.redirect('/static'));
+console.log('Switched to built assets.');