[matplotlib-devel] please add this example: legend translucent

Hi all,
I really liked the snipped John wrote in a mail some time ago, so I
mock up a very simple example to set the alpha on a legend.

It seems interesting to have such an example, also in the gallery.

Since I don't have much time to dive into the sphinx example
generation and so, I just hand you the code, asking to include it.

Cheers,
-- 
Sandro Tosi (aka morph, morpheus, matrixhasu)
My website: http://matrixhasu.altervista.org/
Me at Debian: http://wiki.debian.org/SandroTosi