Create events on comments and milestone

app/views/events/_event.html.haml

@@ -5,6 +5,8 @@
 
     - if event.push?
       = render "events/event/push", event: event
+    - if event.note?
+      = render "events/event/note", event: event
     - else
       = render "events/event/common", event: event
 

app/views/events/event/_note.html.haml

@@ -0,0 +1,16 @@
+.event-title
+  %span.author_name= link_to_author event
+  %span.event_label commented on #{event.target.noteable_type_name}
+  - if event.target and event.target.noteable_id
+    = link_to [event.project, event.target.noteable] do
+      %strong= truncate event.target.noteable_id
+  - else
+    %strong (deleted)
+  at
+  - if event.project
+    = link_to_project event.project
+  - else
+    = event.project_name
+
+.event-body
+  %p.hint= truncate event.target.note, length: 70