Add support for Sass and LESS specific stuff & minor config changes.

I guess it would be cool to make possible to sort pre-processor specific rules: includes, mixins and extends. I've added an array into `sort-order`. This is kinda new feature, so maybe the version should be updated to 1.1.0, according to [Semantic Versioning](http://semver.org).

Almost everybody sort their CSS, or SCSS or whatever on purpose. That purpose would be style guide. One of the most popular ones is [SMACSS](http://smacss.com), this book has a chapter about [formatting code](http://smacss.com/book/formatting). I guess this kind of style guide would be appropriate so I changed `sort-order` a bit.

I've changed `block-indent` and `rule-indent` to fix an issue when you sort already indented Sass or LESS files, previous setup messed everything up.

As for `stick-brace` key, it's value would be 1, because it's like global convention to use such a style, isn't it?