Partially revert 089beb5a103004f07eddcfe0d8c20e059f02fe8d that breaks...

Sass 3.2 compatibility.

Fixes #405.
Merge pull request #408 from jugnoo/bug/triangle_sass_32_compat

Partially revert 089beb5a103004f07eddcfe0d8c20e059f02fe8d that breaks...