console: console.dir() bypasses inspect() methods

Use the `customInspect: false` option of `util.inspect()` to bypass any custom
inspect() function on the object being logged.

Closes #2717.

lib/console.js

@@ -66,7 +66,7 @@ Console.prototype.error = Console.prototype.warn;
 
 
 Console.prototype.dir = function(object) {
-  this._stdout.write(util.inspect(object) + '\n');
+  this._stdout.write(util.inspect(object, { customInspect: false }) + '\n');
 };