Generate ToC links in Markdown output

config/initializers/markdown.rb

@@ -1,11 +1,11 @@
 MKD_SAFE_RENDERER = Redcarpet::Markdown.new(
-  Redcarpet::Render::HTML.new(:filter_html => true, :hard_wrap => true),
+  Redcarpet::Render::HTML.new(:filter_html => true, :hard_wrap => true, :with_toc_data => true),
   :no_intra_emphasis => true,
   :autolink => true
 )
 
 MKD_RENDERER = Redcarpet::Markdown.new(
-  Redcarpet::Render::HTML.new,
+  Redcarpet::Render::HTML.new(:with_toc_data => true),
   :no_intra_emphasis => true,
   :autolink => true
 )