New comments

This branch closes following issues: #171, #172, #178, #189, #196, #202.

- [x] Update tests
- [x] Don't sort properties inside comments
- [x] Support `//` inline comments
- [x] Block comments are grouped with a next rule
- [x] Inline comments are grouped with a previous rule

Please ignore code docs as they will be totally rewritten in next commits.