abstract webserver port

datavis.js

@@ -48,7 +48,7 @@ setTimeout((function() {
 }), 86400000);
 
 // LISTEN
-app.listen(9900, '0.0.0.0', function (err) {
+app.listen(process.env.PORT || 9900, '0.0.0.0', function (err) {
     if (err) {
      console.log(err)
      return

package.json

 {
   "name": "datavis",
-  "version": "0.1.11",
+  "version": "0.1.12",
   "description": "A tool for visualizing the data collected from the IFS Earlham trip",
   "main": "datavis.js",
   "scripts": {