Heroku support (data-govt-nz#5)

* Add heroku procfile

* Set the port

* Force the use of page param no full json set

* Return nothing

* Return page 1 on base

* Start the app via node

* Allow heroku to set the port for serving app

Procfile

@@ -0,0 +1 @@
+web: node web.js

pager-test.js

@@ -3,6 +3,10 @@ var heredoc = require('heredoc')
 
 var app = express();
 
+// set the port of our application
+// process.env.PORT lets the port be set by Heroku
+var port = process.env.PORT || 8080;
+
 var datajson = heredoc(function () {/*
 	{
 		"@context": "https://project-open-data.cio.gov/v1.1/schema/catalog.jsonld",
@@ -333,11 +337,11 @@ app.get('/', function (req, res) {
 	} else if (req.query.page == '2') {
 		res.send(page2);
 	} else {
-		res.send(datajson);
+		res.send(page1);
 	}
 });
 
 
-app.listen(3000, function () {
+app.listen(port, function () {
   console.log('Serve up a paginated example data.json');
 });

web.js

@@ -12,6 +12,10 @@ const upload = multer({storage: multer.memoryStorage()})
  */
 const GLOBAL_DATA = {};
 
+// set the port of our application
+// process.env.PORT lets the port be set by Heroku
+const port = process.env.PORT || 3000;
+
 app.use(bodyParser.urlencoded({extended: true}));
 
 app.get('/', (req, res) => {
@@ -76,7 +80,7 @@ app.get('/api/:id/data.json', (req, res) => {
 app.use('/static', express.static('static'))
 
 
-app.listen(3000, () => console.log('Example app listening on port 3000!'))
+app.listen(port, () => console.log('Example app listening on port 3000!'))
 
 /**
  * A simple utillity function for generating an (fake) GUID-4
@@ -87,4 +91,4 @@ function fakeID() {
           v = c == 'x' ? r : (r&0x3|0x8);
       return v.toString(16);
   });
-}
+}