idangazit/sinter — pull request #1 by magopian (2011-10-09 09:17:59+00:00)
Title: only set column and gutter width if not set yet

By using "!default", it allows for overriding of those widths.

Here's the sass reference for "!default": http://sass-lang.com/docs/yardoc/file.SASS_REFERENCE.html#variable_defaults_