bugfix: properly pass details and msg

lib/errors.js

@@ -71,7 +71,7 @@ module.exports = {
      * @returns {AuthError}
      */
     DEVELOPER_ERROR: function (old, msg, details) {
-        return create(old, msg, E_DEVELOPER, 500, details);
+        return create(old, msg || old, E_DEVELOPER, 500, details);
     },
     BAD_GATEWAY: function (err) {
         var msg =
@@ -83,7 +83,7 @@ module.exports = {
         if (err.response && err.response.statusCode) {
             details.push("response.statusCode = " + err.response.statusCode);
         }
-        return create(msg, msg, E_BAD_GATEWAY, 502);
+        return create(msg, msg, E_BAD_GATEWAY, 502, details);
     },
 
     //