Added code highlighting support in wiki, using this syntax:

<pre><code> <-- cut here

  <pre><code class="ruby">
    Place you code here.
  </code></pre>  

cut here --> </pre></code>

git-svn-id: http://redmine.rubyforge.org/svn/trunk@710 e93f8b46-1217-0410-a6f0-8f06a7374b81

app/views/wiki/edit.rhtml

@@ -25,3 +25,7 @@
 <% end %>
 
 <div id="preview" class="wiki"></div>
+
+<% content_for :header_tags do %>
+  <%= stylesheet_link_tag 'scm' %>
+<% end %>