add extend dependency, use to extend defaults with config in PeerManager instead of overwiting all

PeerManager.js

@@ -1,5 +1,6 @@
 
 var imports         = require('soop').imports();
+var extend          = imports.extend || require('extend');
 var log             = imports.log || require('./util/log');
 var bitcoreDefaults = imports.config || require('./config');
 var Connection      = imports.Connection || require ('./Connection');
@@ -12,7 +13,8 @@ GetAdjustedTime = imports.GetAdjustedTime || function () {
 };
 
 function PeerManager(config) {
-  this.config = config || bitcoreDefaults;
+  // extend defaults with config
+  this.config = extend(true, config || {}, bitcoreDefaults);
   this.active = false;
   this.timer = null;
 

package.json

@@ -70,7 +70,8 @@
     "socks5-client": "~0.3.6",
     "brfs": "=1.0.0",
     "chai": "=1.9.1",
-    "uglifyify": "=1.2.3"
+    "uglifyify": "=1.2.3",
+    "extend": "~1.2.1"
   },
   "devDependencies": {
     "grunt-contrib-watch": "~0.5.3",