remove async extension to a module

lib/contracts/compiler.js

@@ -1,18 +1,7 @@
 /*jshint esversion: 6, loopfunc: true */
-var async = require('async');
+var async = require('../core/async_extend.js');
 var SolcW = require('./solcW.js');
 
-function asyncEachObject(object, iterator, callback) {
-  async.each(
-    Object.keys(object || {}),
-    function(key, next){
-      iterator(key, object[key], next);
-    },
-    callback
-  );
-}
-async.eachObject = asyncEachObject;
-
 var Compiler = function(options) {
   this.plugins = options.plugins;
   this.logger = options.logger;

lib/core/async_extend.js

@@ -0,0 +1,14 @@
+var async = require('async');
+
+function asyncEachObject(object, iterator, callback) {
+  async.each(
+    Object.keys(object || {}),
+    function(key, next){
+      iterator(key, object[key], next);
+    },
+    callback
+  );
+}
+async.eachObject = asyncEachObject;
+
+module.exports = async;

lib/core/services_monitor.js

@@ -1,16 +1,4 @@
-var async = require('async');
-
-// TODO: repeated, add this to an async extensions file
-function asyncEachObject(object, iterator, callback) {
-  async.each(
-    Object.keys(object || {}),
-    function(key, next){
-      iterator(key, object[key], next);
-    },
-    callback
-  );
-}
-async.eachObject = asyncEachObject;
+var async = require('./async_extend.js');
 
 var ServicesMonitor = function(options) {
   this.events = options.events;