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/include_code.rb

@@ -0,0 +1,55 @@
+# Title: Include Code Tag for Jekyll
+# Author: Brandon Mathis http://brandonmathis.com
+# Description: Import files on your filesystem into any blog post as embedded code snippets with syntax highlighting and a download link.
+# Configuration: You can set default import path in _config.yml (defaults to code_dir: downloads/code)
+#
+# Syntax {% include_code path/to/file %}
+#
+# Example:
+# {% include_code javascripts/test.js %}
+#
+# This will import test.js from source/downloads/code/javascripts/test.js
+# and output the contents in a syntax highlighted code block inside a figure,
+# with a figcaption listing the file name and download link
+#
+
+require 'pathname'
+
+module Jekyll
+
+  class IncludeCodeTag < Liquid::Tag
+    def initialize(tag_name, file, tokens)
+      super
+      @file = file.strip
+    end
+
+    def render(context)
+      code_dir = (context.registers[:site].config['code_dir'] || 'downloads/code')
+      code_path = (Pathname.new(context.registers[:site].source) + code_dir).expand_path
+      file = code_path + @file
+
+      if File.symlink?(code_path)
+        return "Code directory '#{code_path}' cannot be a symlink"
+      end
+
+      unless file.file?
+        return "File #{file} could not be found"
+      end
+
+      Dir.chdir(code_path) do
+        code = file.read
+        file_type = file.extname
+        url = "#{context.registers[:site].config['url']}/#{code_dir}/#{@file}"
+        source = "<figure role=code><figcaption><span>#{file.basename}</span> <a href='#{url}'>download</a></figcaption>\n"
+        source += "{% highlight #{file_type} %}\n" + code + "\n{% endhighlight %}</figure>"
+        partial = Liquid::Template.parse(source)
+        context.stack do
+          partial.render(context)
+        end
+      end
+    end
+  end
+
+end
+
+Liquid::Template.register_tag('include_code', Jekyll::IncludeCodeTag)