Removed some unused code that was causing sass compile errors. Thanks to @Arkkimaagi Fixes gskinner#150

Author: wdamien

scss/third-party/compass-mixins/compass/_functions.scss

@@ -1,4 +1,3 @@
-@import "functions/lists";
 @import "functions/cross_browser_support";
 @import "functions/gradient_support";
 @import "functions/constants";