scottkellum/Singularity — pull request #79 by robwierzbowski (2012-12-23 20:13:11+00:00)
Title: Clearfix and border-box settings, related code cleanup

**$set-box-sizing**
Set box-sizing rules on grid spans. Defaults to `true`. If you've already set a universal `box-sizing:border-box;` rule, set this to false and Singularity won't re-declare the rule.

**$custom-clearfix**
Use your own version of float containment. Defaults to `false`. When false, Singularity uses the Compass `pie-clearfix()` mixin. Set this to true and you can define your own clearfix in a mixin named `custom-clearfix()`.

Example:

$custom-clearfix: true;

@mixin custom-clearfix() {
@include legacy-pie-clearfix;
}

**Also**
Removes `overflow:hidden`, `zoom:1`, and ie expression rules outside of clearfix.
Moves clearfix from float/isolation-clear mixins to float/isolation-common mixins.
Fixes https://github.com/scottkellum/Singularity/issues/69