adds new local time helper gem

re: #78

app/assets/javascripts/application.js

@@ -14,3 +14,4 @@
 //= require jquery_ujs
 //= require turbolinks
 //= require modernizr-lite/modernizr
+//= require local_time

app/views/admin/result/_comment.html.erb

@@ -6,9 +6,9 @@
   <% end %>
 
   <% if comment.edits? %>
-    <div>Updated <%= time_ago_in_words(comment.updated_at) %> ago</div>
+    <div>Updated <%= local_time_ago(comment.updated_at) %></div>
   <% else %>
-    <div><%= time_ago_in_words(comment.created_at) %> ago</div>
+    <div><%= local_time_ago(comment.created_at) %></div>
   <% end %>
 </div>