use nodejs http lib directly to check service status

lib/utils.js

@@ -2,7 +2,7 @@
 var path = require('path');
 var grunt = require('grunt');
 var merge = require('merge');
-var request = require('request');
+var http = require('http');
 var shelljs = require('shelljs');
 
 function joinPath() {
@@ -22,8 +22,10 @@ function recursiveMerge(target, source) {
 }
 
 function checkIsAvailable(url, callback) {
-  request(url, function(error, response, body) {
-    callback(!error);
+  http.get(url, function(res) {
+    callback(true);
+  }).on('error', function(res) {
+    callback(false);
   });
 }
 

package.json

@@ -27,7 +27,6 @@
     "fs-extra": "^2.0.0",
     "grunt": "^1.0.1",
     "merge": "^1.2.0",
-    "request": "^2.75.0",
     "serve-static": "^1.11.1",
     "shelljs": "^0.5.0",
     "solc": "0.4.8",