Code Quality++

• Improve code quality widget: https://gitlab.com/gitlab-org/gitlab-ee/issues/2548
• Show code quality notices on diffs/MRs: https://gitlab.com/gitlab-org/gitlab-ee/issues/2526
• Show code quality changes in notification emails: https://gitlab.com/gitlab-org/gitlab-ee/issues/3058
• Show fuller code quality notices inside the mr widget like code climate does: https://gitlab.com/gitlab-org/gitlab-ee/issues/2528
• Code quality severity rating: https://gitlab.com/gitlab-org/gitlab-ee/issues/2529
• Code quality requires codequality.json to be the only artifact file in the job: https://gitlab.com/gitlab-org/gitlab-ee/issues/2877
• Disable merge if MR introduces code quality issues: https://gitlab.com/gitlab-org/gitlab-ee/issues/2547
• Code quality on master: https://gitlab.com/gitlab-org/gitlab-ee/issues/2766
• Show result when Pipeline runs: https://gitlab.com/gitlab-org/gitlab-ee/issues/3607