Merge when build succeeds

CHANGELOG

app/assets/stylesheets/pages/merge_requests.scss

app/controllers/projects/merge_requests_controller.rb

app/models/ci/commit.rb

app/models/commit_status.rb

app/models/merge_request.rb

...vices/merge_requests/merge_when_build_succeeds_service.rb

app/services/merge_requests/refresh_service.rb

app/services/system_note_service.rb

...s/merge_requests/cancel_merge_when_build_succeeds.js.haml

app/views/projects/merge_requests/merge.js.haml

app/views/projects/merge_requests/widget/_open.html.haml

...ews/projects/merge_requests/widget/open/_accept.html.haml

...requests/widget/open/_merge_when_build_succeeds.html.haml

config/routes.rb

...8152939_add_merge_when_build_succeeds_to_merge_request.rb

db/schema.rb