/// Gutter
///
/// @author [@esr360](http://twitter.com/esr360)
/// @access public
/// @group Kayzen-GS
/// @param {bool} $flush [true] - remove margin from first column in row
/// @outputs styles for column gutters
@mixin kgs-gutter($flush: true) {
    margin-left: kgs-option('gutter');
    @if $flush {
        &:first-child {
            margin-left: 0;
        };
    }
}