Support all of Ruby Sass's output styles

[eevee]

If the ultimate goal is to be character-for-character compatible, this will have to happen sometime.

Ruby Sass supports four styles:

• expanded, which is about like our uncompressed
• nested (the default), which cuddles closing braces and indents rules that were nested in the source
• compact, where each rule is one line
• compressed, which is as it sounds

[ryneeverett]

This seems to be fully implemented (though I find the nested output rather weird). Any reason this issue was left open?

Also, the docs are way behind on this, still suggesting @option compress: true; and not even mentioning sccs_opts.