columns-break doesn't exist in --pre 13.0.alpha

README.md

docs reference column-break http://compass-style.org/reference/compass/css3/columns/

the columns mixin file in 13.0 alpha does not contain the following. http://rubygems.org/gems/compass/versions/0.13.alpha.0

_columns.scss

@import "shared";

// Specify the shorthand `columns` property.
//
// Example:
//
//     @include columns(20em 2)
@mixin columns($width-and-count) {
  @include experimental(columns, $width-and-count,
    -moz, -webkit, not -o, -ms, not -khtml, official
  );
}

// Specify the number of columns
@mixin column-count($count) {
  @include experimental(column-count, $count,
    -moz, -webkit, not -o, -ms, not -khtml, official
  );
}

// Specify the gap between columns e.g. `20px`
@mixin column-gap($width) {
  @include experimental(column-gap, $width,
    -moz, -webkit, not -o, -ms, not -khtml, official
  );
}

// Specify the width of columns e.g. `100px`
@mixin column-width($width) {
  @include experimental(column-width, $width,
    -moz, -webkit, not -o, -ms, not -khtml, official
  );
}

// Specify the width of the rule between columns e.g. `1px`
@mixin column-rule-width($width) {
  @include experimental(rule-width, $width,
    -moz, -webkit, not -o, -ms, not -khtml, official
  );
}

// Specify the style of the rule between columns e.g. `dotted`.
// This works like border-style.
@mixin column-rule-style($style) {
  @include experimental(rule-style, unquote($style),
    -moz, -webkit, not -o, -ms, not -khtml, official
  );
}

// Specify the color of the rule between columns e.g. `blue`.
// This works like border-color.
@mixin column-rule-color($color) {
  @include experimental(rule-color, $color,
    -moz, -webkit, not -o, -ms, not -khtml, official
  );
}

// Mixin encompassing all column rule properties
// For example:
//
//     @include column-rule(1px, solid, #c00)
//
// Or the values can be space separated:
//
//     @include column-rule(1px solid #c00)
@mixin column-rule($width, $style: false, $color: false) {
  $full : -compass-space-list(compact($width, $style, $color));
  @include experimental(column-rule, $full,
    -moz, -webkit, not -o, -ms, not -khtml, official
  );
}