add simplest possible express server to host files

...this is much better for development, so you can run many different servers
that have different HTML 5 local storages for testing purposes.

README.md

@@ -7,11 +7,23 @@ Copy config.template.js to config.js and edit to suit your needs. (Defaults to
 public PeerJS and Insight servers)
 
 Then execute these commands:
-
 ```
 npm install
 bower install
 grunt --target=dev shell
+node app.js
 ```
 
-Then open index.html in your browser.
+To run on a different port:
+```
+PORT=3001 node app.js
+```
+
+To open up five different instances to test 3-of-5 multisig with yourself, then run this in 5 different terminals:
+```
+PORT=3001 node app.js
+PORT=3002 node app.js
+PORT=3003 node app.js
+PORT=3004 node app.js
+PORT=3005 node app.js
+```

app.js

@@ -0,0 +1,12 @@
+var express=require("express");
+var http=require("http");
+
+var app=express();
+
+var port = process.env.PORT || 3000;
+app.set("port", port);
+app.use(express.static(__dirname));
+
+app.listen(port, function(){
+  console.log("Listening at: http://localhost:" + port);
+});

package.json

@@ -19,6 +19,7 @@
   },
   "homepage": "https://github.com/bitpay/copay",
   "devDependencies": {
+    "express": "4.0.0",
     "grunt-contrib-watch": "~0.5.3",
     "grunt-mocha-test": "~0.8.2",
     "grunt-shell": "~0.6.4",