replace extend with underscore and use it's version of extend from within PeerManager

lib/PeerManager.js

@@ -1,5 +1,5 @@
 var imports         = require('soop').imports();
-var extend          = imports.extend || require('extend');
+var _               = imports._ || require('underscore');
 var log             = imports.log || require('../util/log');
 var bitcoreDefaults = imports.config || require('../config');
 var Connection      = imports.Connection || require ('./Connection');
@@ -12,7 +12,7 @@ GetAdjustedTime = imports.GetAdjustedTime || function () {
 
 function PeerManager(config) {
   // extend defaults with config
-  this.config = extend(true, config || {}, bitcoreDefaults);
+  this.config = _.extend(bitcoreDefaults, config || {});
   this.active = false;
   this.timer = null;
 

package.json

@@ -71,8 +71,8 @@
     "brfs": "=1.0.0",
     "chai": "=1.9.1",
     "uglifyify": "=1.2.3",
-    "extend": "~1.2.1",
-    "async": "~0.2.10"
+    "async": "~0.2.10",
+    "underscore": "~1.6.0"
   },
   "devDependencies": {
     "grunt-contrib-watch": "~0.5.3",