added news updates ui

app/views/news_updates/_listing.html.erb

@@ -0,0 +1,11 @@
+<% cache("news-updates", :expires_in => 1.hour) do %>
+  <div id="news-updates" data-updated-at="<%= NewsUpdate.recent.first.try(:created_at).try(:strftime, "%m/%d/%Y") %>">
+    <ul>
+      <% NewsUpdate.recent.each do |news_update| %>
+        <li><%= news_update.created_at.strftime("%m/%d") %>: <%= news_update.message.html_safe %></li>
+      <% end %>
+    </ul>
+
+    <a href="#" id="close-news-ticker-link">close</a>
+  </div>
+<% end %>