Fix env-js node 0.4.2 incompatibility.

The `console` global is read-only; it cannot be reassigned.

lib/env-js/envjs/platform/core.js

@@ -42,9 +42,7 @@ var log = {
     exception: function(){return this;}
 };
 
-try{
-	console = console;
-}catch(e){
+if (typeof console == "undefined") {
 	console = require('envjs/console').console;
 }