Duplicate styles if using radix as base theme

Hi,

if i am using radix as base theme it will be load "radix-style.css" which includes the bootstrap css because the sass file imports the compass_radix. The Subtheme import the compass_radix also so we have a lot redundant css code here. This only happens if you create a own sub theme thats not based upon "default" kit. I think this should be documented or the logic for removed the style should be inversed (only add css if base theme is actual theme)

Edit:
i attached a suggestion patch for this behavior