sass/libsass — pull request #709 by xzyfer (2014-12-09 22:40:45+00:00)
Title: Implement feature-exists()

This PR implement `feature-exists()`. Ruby sass has 4 defined features, all of which are unsupported by Libsass at the moment.

Fixes https://github.com/sass/libsass/issues/702. Specs added https://github.com/sass/sass-spec/pull/161.