Changes since 7.x-3.x-alpha4

1. #28: !22: bda2102f Merge branch 'issue-28-readd-challenge_perm_to_nginx_vhost' into 'master'
2. #30: !12: f4bdb414 Merge branch 'feature/depends' into 'master'
3. #25: !32: d17bbed6 Merge branch 'document-forced-cert-regeneration' into 'master'
4. #40: !31: 6fc0d366 Merge branch 'feature/add_missing_hooks' into 'master'
5. #24: !34: bb3aa3a7 Merge branch 'remove_orphaned_services_check' into 'master'
6. #48: !35: f04f0cec Merge branch '48-default-to-letsencrypt-s-production-service' into 'master'
7. #47: !33: 0e8cc2fa Merge branch 'issue-47' into 'master'