naz

refs https://github.com/TryGhost/gscan/pull/386 It's an unfinished piece of work that came after trying to simplify syntax in the koenig css classes checker. If anybody sees this feel free to pick up....

### Objective Theme fatal errors, errors, warnings, and recommendations should be grouped separately. Eventually, messages should be grouped by (1) message level and then (2) by file. ### Grouping design...