Support libsass based projects
This commit removes Compass as a dependency from medium-editor. This enables us to keep 100% within the JS realm. Combined with autoprefixer Compass becomes redundant for this project and by ignoring old vendor-prefixes using autoprefixer we can also enjoy a 54% total size reduction for the CSS files.
Fix imports in themes
Merge pull request #168 from jmagnusson/no-compass

No compass