merge config in develop

lib/environment.js

@@ -7,6 +7,7 @@ var TestRPC = require("ethereumjs-testrpc");
 var spawn = require("child_process").spawn;
 var path = require("path");
 var Develop = require("./develop");
+var _ = require("lodash");
 
 var Environment = {
   // It's important config is a Config object and not a vanilla object
@@ -117,12 +118,12 @@ var Environment = {
     var network = config.network || "develop";
     var url = `http://${testrpcOptions.host}:${testrpcOptions.port}/`;
 
-    config.networks[network] = {
+    config.networks[network] = _.extend({}, {
       network_id: testrpcOptions.network_id,
       provider: function() {
         return new Web3.providers.HttpProvider(url);
       }
-    };
+    }, config.networks[network]);
 
     config.network = network;