Fixed #10072 -- `GMarker` overlays now have `draggable` option. Thanks to...

Fixed #10072 -- `GMarker` overlays now have `draggable` option.  Thanks to prairiedogg for ticket and patch.


git-svn-id: http://code.djangoproject.com/svn/django/trunk@10002 bcc190cf-cafb-0310-a4f2-bffc1f526a37