app/assets/stylesheets/mixins/_grid.scss
// will make the element grid-like with the specified number of columns
//
// $number - bumber of columns
@mixin grid-with-columns($number) {
@include span(1 of $number 0.05);
&:nth-child(#{$number}n) {
@include omega;
}
&:nth-child(#{$number}n+1) {
clear:both;
}
}