changed serialization frm to_dict to marhsmellow
changed serialization frm to_dict to marhsmellow

the serializer in upload and upload from url method now uses the
marshmellow serializer

VirtualWatershed/vwadaptor,itsrifat/vwadaptor,itsrifat/vwadaptor,itsrifat/vwadaptor,VirtualWatershed/vwadaptor,VirtualWatershed/vwadaptor