Ability to close milestone from milestones -> index

app/views/milestones/_milestone.html.haml

@@ -4,6 +4,8 @@
       = link_to edit_project_milestone_path(milestone.project, milestone), class: "btn btn-small edit-milestone-link grouped" do
         %i.icon-edit
         Edit
+      - if milestone.can_be_closed?
+        = link_to 'Close', project_milestone_path(@project, milestone, milestone: {state_event: :close }), method: :put, remote: true, class: "btn btn-small btn-remove"
   %h4
     = link_to_gfm truncate(milestone.title, length: 100), project_milestone_path(milestone.project, milestone)
     - if milestone.expired? and not milestone.closed?

app/views/milestones/update.js.haml

+:plain
+  $('##{dom_id(@milestone)}').fadeOut();