Moved plugins to root directory. I'm ditching the idea of shipping plugins with themes until it's more obviously necessary. This way it's easier to merge and update plugins.

plugins/code_block.rb

@@ -0,0 +1,80 @@
+# Title: Simple Code Blocks for Jekyll
+# Author: Brandon Mathis http://brandonmathis.com
+# Description: Write codeblocks with semantic HTML5 <figure> and <figcaption> elements and optional syntax highlighting — all with a simple, intuitive interface.
+#
+# Syntax: {% codeblock [title] [url] [link text] %}
+#
+# For syntax highlighting, put a file extension somewhere in the title. examples:
+# {% codeblock file.sh %}
+# {% codeblock Time to be Awesome! (awesome.rb) %}
+#
+# Example:
+#
+# {% codeblock Got pain? painreleif.sh http://site.com/painreleief.sh Download it! %}
+# $ rm -rf ~/PAIN
+# {% endcodeblock %}
+#
+# Output:
+#
+# <figure role=code>
+# <figcaption><span>Got pain? painrelief.sh</span> <a href="http://site.com/painrelief.sh">Download it!</a>
+# <div class="highlight"><pre><code class="sh">
+# -- nicely escaped highlighted code --
+# </code></pre></div>
+# </figure>
+#
+# Example 2 (no syntax highlighting):
+#
+# {% codeblock %}
+# <sarcasm>Ooooh, sarcasm... How original!</sarcasm>
+# {% endcodeblock %}
+#
+# <figure role=code>
+# <pre><code>&lt;sarcasm> Ooooh, sarcasm... How original!&lt;/sarcasm></code></pre>
+# </figure>
+#
+module Jekyll
+
+  class CodeBlock < Liquid::Block
+    CaptionUrlTitle = /(\S[\S\s]*)\s+(https?:\/\/)(\S+)\s+(.+)/i
+    CaptionUrl = /(\S[\S\s]*)\s+(https?:\/\/)(\S+)/i
+    Caption = /(\S[\S\s]*)/
+    def initialize(tag_name, markup, tokens)
+      @title = nil
+      @caption = nil
+      @highlight = true
+      if markup =~ CaptionUrlTitle
+        @file = $1
+        @caption = "<figcaption><span>#{$1}</span><a href='#{$2 + $3}'>#{$4}</a</figcaption>"
+      elsif markup =~ CaptionUrl
+        @file = $1
+        @caption = "<figcaption><span>#{$1}</span><a href='#{$2 + $3}'>link</a</figcaption>"
+      elsif markup =~ Caption
+        @file = $1
+        @caption = "<figcaption><span>#{$1}</span></figcaption>\n"
+      end
+      if @file =~ /\S[\S\s]*\.(\w+)/
+        @filetype = $1
+      end
+      super
+    end
+
+    def render(context)
+      output = super
+      code = super.join
+      source = "<figure role=code>\n"
+      source += @caption if @caption
+      if @filetype
+        source += "{% highlight #{@filetype} %}\n" + code + "\n{% endhighlight %}\n</figure>"
+      else
+        source += "<pre><code>" + code.gsub!(/</,'&lt;') + "</code></pre>\n</figure>"
+      end
+      partial = Liquid::Template.parse(source)
+      context.stack do
+        partial.render(context)
+      end
+    end
+  end
+end
+
+Liquid::Template.register_tag('codeblock', Jekyll::CodeBlock)