Don't install sass

5b860b29 removed the dependency on sass.
Merge pull request #567 from ithinkihaveacat/patch-1

Don't install sass
Fixes #570 - osx font smoothing for mox
fix invalid hamburger.svg

https://github.com/svg/svgo/issues/277
https://github.com/svg/svgo/issues/289
bump deps
Merge branch 'master' into webpage
blog link fix