Added resolve button to discussions

app/assets/javascripts/line_comments/application.js.coffee

...avascripts/line_comments/components/resolve_all.js.coffee

...avascripts/line_comments/components/resolve_btn.js.coffee

...ascripts/line_comments/components/resolve_count.js.coffee

...sets/javascripts/line_comments/services/resolve.js.coffee

...ssets/javascripts/line_comments/stores/comments.js.coffee

app/assets/javascripts/merge_request_tabs.js.coffee

app/assets/javascripts/notes.js.coffee

app/assets/stylesheets/pages/note_form.scss

app/helpers/notes_helper.rb

app/views/discussions/_diff_discussion.html.haml

app/views/discussions/_parallel_diff_discussion.html.haml

app/views/projects/merge_requests/_show.html.haml

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

app/views/projects/notes/discussions/_resolve_all.html.haml