Refactor merge request widget step 2

app/assets/javascripts/merge_request.js.coffee

app/assets/stylesheets/pages/merge_requests.scss

app/controllers/projects/merge_requests_controller.rb

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

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

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

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

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

...views/projects/merge_requests/widget/_mr_accept.html.haml

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

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

...iews/projects/merge_requests/widget/open/_check.html.haml

...s/projects/merge_requests/widget/open/_conflict.html.haml

.../projects/merge_requests/widget/open/_conflicts.html.haml

...rojects/merge_requests/widget/open/_not_allowed.html.haml

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

app/views/projects/merge_requests/widget/open/_wip.html.haml