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/render_partial.rb

@@ -0,0 +1,52 @@
+# Title: Render Partial Tag for Jekyll
+# Author: Brandon Mathis http://brandonmathis.com
+# Description: Import files on your filesystem into any blog post and render them inline.
+# Note: Paths are relative to the source directory
+#
+# Syntax {% render_partial path/to/file %}
+#
+# Example 1:
+# {% render_partial about/_bio.markdown %}
+#
+# This will import source/about/_bio.markdown and render it inline.
+# In this example I used an underscore at the beginning of the filename to prevent Jekyll
+# from generating an about/bio.html (Jekyll doesn't convert files beginning with underscores)
+#
+# Example 2:
+# {% render_partial ../README.markdown %}
+#
+# You can use relative pathnames, to include files outside of the source directory.
+# This might be useful if you want to have a page for a project's README without having
+# to duplicated the contents
+#
+
+require 'pathname'
+
+module Jekyll
+
+  class RenderPartialTag < Liquid::Tag
+    def initialize(tag_name, file, tokens)
+      super
+      @file = file.strip
+    end
+
+    def render(context)
+      file_dir = (context.registers[:site].source || 'source')
+      file_path = Pathname.new(file_dir).expand_path
+      file = file_path + @file
+
+      unless file.file?
+        return "File #{file} could not be found"
+      end
+
+      Dir.chdir(file_path) do
+        partial = Liquid::Template.parse(file.read)
+        context.stack do
+          partial.render(context)
+        end
+      end
+    end
+  end
+end
+
+Liquid::Template.register_tag('render_partial', Jekyll::RenderPartialTag)