Merge branch 'master' into improve-white-code-highlight

app/models/project_services/flowdock_service.rb

app/models/project_services/gemnasium_service.rb

app/models/project_services/gitlab_ci_service.rb

lib/backup/repository.rb

lib/gitlab/backend/shell.rb

lib/gitlab/git_ref_validator.rb

lib/gitlab/utils.rb

lib/tasks/gitlab/shell.rake

spec/models/gitlab_ci_service_spec.rb

spec/requests/api/repositories_spec.rb