Merge branch 'remove_extra_css_class_from_markdown' into 'master'

Remove extra css class from markdown

Extra css class prevented attachments uploader from functioning correctly.

This caused dropzone wrapper classes to be appended to the wrong class and further prevented the dropzone gem from functioning correctly.

Removing this extra class allows attachment upload to function again while keeping the feature introduced here intact.

Fixes #1831

See merge request !1338

app/views/projects/notes/_note.html.haml

@@ -46,7 +46,7 @@
         .note-edit-form
           = form_for note, url: project_note_path(@project, note), method: :put, remote: true, authenticity_token: true do |f|
             = render layout: 'projects/md_preview' do
-              = f.text_area :note, class: 'note_text js-note-text markdown-area js-gfm-input turn-on'
+              = f.text_area :note, class: 'note_text js-note-text js-gfm-input turn-on'
 
             .form-actions.clearfix
               = f.submit 'Save changes', class: "btn btn-primary btn-save js-comment-button"