Add classes and modules list to class page's sidebar

Author: st0012

lib/rdoc/generator/template/aliki/class.rhtml

@@ -9,6 +9,7 @@
   <%= render '_sidebar_includes.rhtml' %>
   <%= render '_sidebar_extends.rhtml' %>
   <%= render '_sidebar_methods.rhtml' %>
+  <%= render '_sidebar_classes.rhtml' %>
 </nav>
 
 <main role="main" aria-labelledby="<%= h klass.aref %>">