Update thumbnails.
MODIFY
tutorials/basic/thumb.jpg
tutorials/basic/thumb.jpg
Binary files a/tutorials/basic/thumb.jpg and b/tutorials/basic/thumb.jpg differ

ADD
tutorials/choropleth/thumb.jpg
tutorials/choropleth/thumb.jpg
Binary files /dev/null and b/tutorials/choropleth/thumb.jpg differ

ADD
tutorials/contour/thumb.jpg
tutorials/contour/thumb.jpg
Binary files /dev/null and b/tutorials/contour/thumb.jpg differ

MODIFY
tutorials/editor/thumb.jpg
tutorials/editor/thumb.jpg
Binary files a/tutorials/editor/thumb.jpg and b/tutorials/editor/thumb.jpg differ

MODIFY
tutorials/simple_point/thumb.jpg
tutorials/simple_point/thumb.jpg
Binary files a/tutorials/simple_point/thumb.jpg and b/tutorials/simple_point/thumb.jpg differ

MODIFY
tutorials/tile_source/thumb.jpg
tutorials/tile_source/thumb.jpg
Binary files a/tutorials/tile_source/thumb.jpg and b/tutorials/tile_source/thumb.jpg differ

MODIFY
tutorials/video_on_map/thumb.jpg
tutorials/video_on_map/thumb.jpg
Binary files a/tutorials/video_on_map/thumb.jpg and b/tutorials/video_on_map/thumb.jpg differ

MODIFY
tutorials/video_single/thumb.jpg
tutorials/video_single/thumb.jpg
Binary files a/tutorials/video_single/thumb.jpg and b/tutorials/video_single/thumb.jpg differ

MODIFY
tutorials/video_transport/thumb.jpg
tutorials/video_transport/thumb.jpg
Binary files a/tutorials/video_transport/thumb.jpg and b/tutorials/video_transport/thumb.jpg differ

MODIFY
tutorials/wms/thumb.jpg
tutorials/wms/thumb.jpg
Binary files a/tutorials/wms/thumb.jpg and b/tutorials/wms/thumb.jpg differ

Update thumbnails.