Merge branch 'ui/emoji' into 'master'

UI: Award emoji tweaks

Before:

![emoji_before](/uploads/82786924d3cea0313321b9dde0356cd2/emoji_before.png)

After:

![emoji_after](/uploads/07e94401701d7a622c3ed5cbaa148244/emoji_after.png)

See merge request !1960

app/assets/stylesheets/pages/issuable.scss

@@ -158,6 +158,7 @@
       min-width: 214px;
 
       > li {
+        cursor: pointer;
         margin: 5px;
       }
     }

app/helpers/issues_helper.rb

@@ -96,7 +96,7 @@ module IssuesHelper
 
   def emoji_author_list(notes, current_user)
     list = notes.map do |note|
-             note.author == current_user ? "me" : note.author.username
+             note.author == current_user ? "me" : note.author.name
            end
 
     list.join(", ")