diff --git a/.themes/classic/source/_includes/facebook_like.html b/.themes/classic/source/_includes/facebook_like.html
index 74f9130..d263e6d 100644
--- a/.themes/classic/source/_includes/facebook_like.html
+++ b/.themes/classic/source/_includes/facebook_like.html
@@ -3,7 +3,7 @@
 <script>(function(d, s, id) {
   var js, fjs = d.getElementsByTagName(s)[0];
   if (d.getElementById(id)) {return;}
-  js = d.createElement(s); js.id = id;
+  js = d.createElement(s); js.id = id; js.async = true;
   js.src = "//connect.facebook.net/en_US/all.js#appId=212934732101925&xfbml=1";
   fjs.parentNode.insertBefore(js, fjs);
 }(document, 'script', 'facebook-jssdk'));</script>
diff --git a/.themes/classic/source/_includes/head.html b/.themes/classic/source/_includes/head.html
index 75c76cc..8de6679 100644
--- a/.themes/classic/source/_includes/head.html
+++ b/.themes/classic/source/_includes/head.html
@@ -20,10 +20,10 @@
   <link rel="canonical" href="{{ canonical }}">
   <link href="{{ root_url }}/favicon.png" rel="icon">
   <link href="{{ root_url }}/stylesheets/screen.css" media="screen, projection" rel="stylesheet" type="text/css">
+  <link href="{{ site.subscribe_rss }}" rel="alternate" title="{{site.title}}" type="application/atom+xml">
+  {% include custom/head.html %}
   <script src="{{ root_url }}/javascripts/modernizr-2.0.js"></script>
   <script src="{{ root_url }}/javascripts/ender.js"></script>
   <script src="{{ root_url }}/javascripts/octopress.js" type="text/javascript"></script>
-  <link href="{{ site.subscribe_rss }}" rel="alternate" title="{{site.title}}" type="application/atom+xml">
-  {% include custom/head.html %}
   {% include google_analytics.html %}
 </head>
diff --git a/plugins/category_generator.rb b/plugins/category_generator.rb
index d4840a8..a49c429 100644
--- a/plugins/category_generator.rb
+++ b/plugins/category_generator.rb
@@ -19,6 +19,8 @@
 # - category_title_prefix: The string used before the category name in the page title (default is
 #                          'Category: ').
 
+require 'stringex'
+
 module Jekyll
 
   # The CategoryIndex class creates a single category page for the specified category.
@@ -106,7 +108,7 @@ module Jekyll
       if self.layouts.key? 'category_index'
         dir = self.config['category_dir'] || 'categories'
         self.categories.keys.each do |category|
-          self.write_category_index(File.join(dir, category.gsub(/_|\P{Word}/, '-').gsub(/-{2,}/, '-').downcase), category)
+          self.write_category_index(File.join(dir, category.to_url), category)
         end
 
       # Throw an exception if the layout couldn't be found.
@@ -171,7 +173,7 @@ ERR
     #
     def category_link(category)
       dir = @context.registers[:site].config['category_dir']
-      "<a class='category' href='/#{dir}/#{category.gsub(/_|\P{Word}/, '-').gsub(/-{2,}/, '-').downcase}/'>#{category}</a>"
+      "<a class='category' href='/#{dir}/#{category.to_url}/'>#{category}</a>"
     end
 
     # Outputs the post.date as formatted html, with hooks for CSS styling.
diff --git a/plugins/pygments_code.rb b/plugins/pygments_code.rb
index 1676a3e..87d3cd6 100644
--- a/plugins/pygments_code.rb
+++ b/plugins/pygments_code.rb
@@ -21,7 +21,11 @@ module HighlightCode
       if File.exist?(path)
         highlighted_code = File.read(path)
       else
-        highlighted_code = Pygments.highlight(code, :lexer => lang, :formatter => 'html', :options => {:encoding => 'utf-8'})
+        begin
+          highlighted_code = Pygments.highlight(code, :lexer => lang, :formatter => 'html', :options => {:encoding => 'utf-8'})
+        rescue MentosError
+          raise "Pygments can't parse unknown language: #{lang}."
+        end
         File.open(path, 'w') {|f| f.print(highlighted_code) }
       end
     else