nex3/sass — pull request #629 by svallory (2013-01-16 19:58:43+00:00)
Title: Adds :staleness_check => true to options passed to importer when that's the case

As explained in https://github.com/nex3/sass/issues/625#issuecomment-12334541 this change allows to create custom importers which only require a file once.