Add latest changes from gitlab-org/gitlab@master

doc/integration/saml.md

lib/api/api.rb

lib/api/deployments.rb

lib/api/entities/error_tracking.rb

lib/api/error_tracking.rb

lib/api/helpers/merge_requests_helpers.rb

lib/api/merge_requests.rb

lib/gitlab/app_json_logger.rb

lib/gitlab/app_logger.rb

lib/gitlab/app_text_logger.rb

lib/gitlab/multi_destination_logger.rb

package.json

...rowser_ui/2_plan/email/trigger_email_notification_spec.rb

...ecs/features/browser_ui/2_plan/issue/create_issue_spec.rb

...res/browser_ui/2_plan/issue/filter_issue_comments_spec.rb

spec/finders/merge_requests_finder_spec.rb

spec/lib/gitlab/app_json_logger_spec.rb

spec/lib/gitlab/app_logger_spec.rb

spec/lib/gitlab/app_text_logger_spec.rb

spec/lib/gitlab/multi_destination_logger_spec.rb