Libsass: Release 3.4

Almost two years ago @mgreter and @xzyfer began heavily contributing to LibSass. With the project progressing rapidly the Sass team went into a feature freeze to give us chance to catch up. We've made a lot of progress towards this goal, reaching near feature parity.

With the ES6 gold-rush over browser vendors are starting to ship new CSS features. Some of these features are incompatible with Sass 3.4. In some case the community was forced to either not use these new CSS features or not use Sass. Conscious of negatively impacting the community Sass has come out of feature freeze and 3.5 has entered it's first Release Candidate.

The last two years has seen rapid adoption of LibSass with Node Sass reach +2M monthly downloads. We've become a critical part of the Sass ecosystem, and as such the Sass 3.5 will stay in release candidate until we're at feature parity.

All told releasing 3.4, and shipping 3.5 features is becoming critical for the community. We accept there will be a long tale of bugs that decrease as we move our implementation closer the reference implementation. However there are still a couple significant issues we should try to address before shipping 3.4 stable.

I've updated the Sass 3.4 milestone to contain only significant issues we should try to address before release. These bugs prevent users adopting LibSass due to false compilation errors or producing semantically different output.

I've done some additional maintenance of the issue tracker

• high priority, non-critical bugs to the Sass 3.4.1 milestone.
• all non-critical 3.4 bugs are labeled as Sass 3.4 Compatibility label

I'll be release 3.3.7 this week, and shift focus to releasing 3.4 asap.

CITGM

• [x] eyeglass (sass-eyeglass/eyeglass/pull/145)
• [x] sassdash
• [ ] bootstrap v4-dev

• [ ] foundation

  Regressions

• [x] @at-root regression (#2198)

• [x] @extends regression (#2200)

/cc @chriseppstein @nex3