Work around RDiscount bug where Markdown after Pygments-highlighted code would not be parsed as Markdown.

See http://gist.github.com/97682 for a runnable example of the bug.

Signed-off-by: Nick Quaranto <nick@quaran.to>

lib/jekyll/albino.rb

@@ -71,7 +71,9 @@ class Albino
   end
 
   def colorize(options = {})
-    execute @@bin + convert_options(options)
+    html = execute(@@bin + convert_options(options))
+    # Work around an RDiscount bug: http://gist.github.com/97682
+    html.to_s.sub(%r{</pre></div>\Z}, "</pre>\n</div>")
   end
   alias_method :to_s, :colorize