[#32937] Get media from module folder

I really love build extension in originally extension folder. Like language where if the language exists in extension folder, joomla by default load the file. I believe this feature can happen for media folder too.

Pull Request: #32937

http://joomlacode.org/gf/project/joomla/tracker/?action=TrackerItemEdit&tracker_item_id=32937&start=0