removed AxisVisual from grid examples
removed AxisVisual from grid examples

drufat/vispy,michaelaye/vispy,ghisvail/vispy,Eric89GXL/vispy,Eric89GXL/vispy,drufat/vispy,michaelaye/vispy,michaelaye/vispy,ghisvail/vispy,ghisvail/vispy,Eric89GXL/vispy,drufat/vispy