errors from external services have different status and message property names

lib/expressapp.js

@@ -80,8 +80,8 @@ ExpressApp.prototype.start = function(opts, cb) {
     } else {
       var code, message;
       if (_.isObject(err)) {
-        code = err.code;
+        code = err.code || err.statusCode;
-        message = err.message;
+        message = err.message || err.body;
       }
       var m = message || err.toString();