> I really prefer Bootstraps grid over something like Bourboun's Neat grid system[0] where I have to pollute my CSS with include statements.

What about creating silent classes for the column sizes you use and `@extend`ing those classes?

  %three-columns {
    @include span-columns(3);
  }
  
  .sidebar {
    @extend %three-columns;
  }
  
  .menu {
    @extend %three-columns;
    background-color: #facade;
  }