Added colored stylesheet for rendering polls

app/views/polls/index.html.erb

 <h2>Polls</h2>
 
+<% html_title "Polls" %>
+
+<% content_for :header_tags do %>
+  <%= stylesheet_link_tag 'voting', :plugin => 'polls' %>
+<% end %>
+
 <% @polls.each do |poll| %>
   <p>
   <%= poll.question %>?

assets/stylesheets/voting.css

+a.vote { font-size: 120%; }
+a.vote.yes { color: green; }
+a.vote.no { color: red; }
+