Compatibility fix for change in styl library

Since the [options refactoring](https://github.com/visionmedia/styl/commit/04cb3a271c7e2e59899b5d624148c4a561556ae7) in styl you can no longer pass through the whitespace significant option. This resolves that.
Merge pull request #8 from Josiah/patch-1

Compatibility fix for change in styl library