Release v0.9.2

Builds upon [Release v0.9.1](https://github.com/sintaxi/terraform/pull/59), which is ready to merge, but this isn’t.

Everything using their latest version except for:
- Jade is still at v0.35.0 for `!!!`
- Stylus stopped factoring in whitespace for error line numbers at v0.48.0

Changes that make this possible:
- Sass error parsing updated
- SCSS error parsing updated
- Marked rendered added to remove header IDs (which I included to past the tests, but I think we should remove this code and close https://github.com/sintaxi/harp/issues/328 instead)

Tested on:
- [ ] OS X 10.8.5
- [ ] OS X 10.10
- [ ] Ubuntu
- [ ] Windows 8.1