adding initial.js to show Gmail-like user avatars; adding avatar_image helper to abstract from plugin options adding the two currently used styles, profile and small

app/views/debates/show.html.erb

@@ -14,7 +14,7 @@
       <h1><%= @debate.title %></h1>
 
       <div class="debate-info">
-        <%= image_tag('user_default.jpg', class: 'author-photo', size: '32x32') %>
+        <%= avatar_image(@debate.author, style: :small) %>
         <span class="author">
             <%= @debate.author.name %>
         </span>
@@ -62,4 +62,4 @@
       <%= render @debate.root_comments.recent %>
     </div>
   </div>
-</section>
+</section>