Security Fixes
- Rails 5.0 -> 5.1 -> 5.2 upgrade; adoption of ChefStyle #1867 (robbkidd)
- Bump rack from 2.0.8 to 2.2.2 in quality metrics engine #1858 (dependabot-preview[bot])
- Bump kaminari from 1.0.1 to 1.2.1 #1862 (dependabot-preview[bot])
- Bump rack from 2.2.2 to 2.2.3 #1868 (dependabot[bot])