Bind to configurable ip

package.json

@@ -26,7 +26,6 @@
     "test": "istanbul cover ./node_modules/mocha/bin/_mocha --report lcovonly -- -R spec && cat ./coverage/lcov.info | ./node_modules/coveralls/bin/coveralls.js && rm -rf ./coverage"
   },
   "dependencies": {
-    "canvas": "1.1.6",
     "forever": "^0.13.0",
     "jade": "~1.9.1",
     "lwip": "0.0.6",

server.js

@@ -87,7 +87,9 @@ function requestHandler(req, res) {
 }
 
 var boot = module.exports = function () {
-  http.createServer(requestHandler).listen(process.env.PORT || 3000);
+  var port = process.env.PORT || 3000;
+  var bind_ip = process.env.BIND || '127.0.0.1';
+  http.createServer(requestHandler).listen(port, bind_ip);
 };
 
 if (require.main === module) {