add option for shortest path from purple to blue

[woulf]

Hello, when i use

oldcolor = Color('#800080')
newcolor = Color('#000080')
oldcolor.range_to(newcolor, 100)

the list goes through the whole rainbow (red, yellow, etc).
An option for a range with a shortest path, kind of a CMYK way, transitioning trough mauve or lilac to blue would be nice.