Regeneration of gradients:

0) Grab a new .css for the webgradients
1) Run the gradientgen.js script (requires node):

   gradientgen.js enum webgradients.css    # will regen the enumeration names (on stdout)
   gradientgen.js json webgradients.css    # will regen the actual gradients (on stdout)

2) Build gradientgen.pro
3) Run gradientgen, passing the json as stdin, the result will be on stdout