twitter/bootstrap — pull request #2527 by Barryvdh (2012-03-12 14:18:38+00:00)
Title: Responsive makeColumn/makeRow and use global variables

- Create 2 different makeColumn/makeRow mixins with guard expressions.

- Make parameters optional in the grid() mixin (default to global variables)

- Override grid variables in responsive.less, to make makeColumn work

This enables creating 1 mixin with .makeColumn and .makeRow, and have the possibility to collapse, just like the regular spans (or define columns/rows in mediaqueries)

@media (max-width: 767px) {
// Custom grid
@gridColumnWidth: auto;
@gridGutterWidth: 0;

#custom > .grid();
}

(For issue #2242 #2448 and #1636