Improved documentation.

Signed-off-by: Martin Raspaud <martin.raspaud@smhi.se>
Added the set_range method to colormaps and fixed the colorbar function.

Signed-off-by: Martin Raspaud <martin.raspaud@smhi.se>
Documentation enhancement.

Signed-off-by: Martin Raspaud <martin.raspaud@smhi.se>
Fixed documentation.

Signed-off-by: Martin Raspaud <martin.raspaud@smhi.se>
Add an image on the home page.

Signed-off-by: Martin Raspaud <martin.raspaud@smhi.se>