schedule-for-stop return empty stopHeadsign in scheduleStopTimes element

[lubbo]

schedule-for-stop API always return empty stopHeadsign

In my usecase http://transitfeeds.com/p/actv/631/latest/file/stop_times.txt this field is useful to identify the trip destination in a simple and meaningful way.

Looking at the code, some part are missing from bundle creation to action bean result.

Pull request coming ...