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/pygments_cache_patch.rb

@@ -0,0 +1,30 @@
+#
+# Author: Raimonds Simanovskis, http://blog.rayapps.com/
+# Source URL: https://github.com/rsim/blog.rayapps.com/blob/master/_plugins/pygments_cache_patch.rb
+#
+
+require 'fileutils'
+require 'digest/md5'
+
+PYGMENTS_CACHE_DIR = File.expand_path('../../_code_cache', __FILE__)
+FileUtils.mkdir_p(PYGMENTS_CACHE_DIR)
+
+Jekyll::HighlightBlock.class_eval do
+  def render_pygments(context, code)
+    if defined?(PYGMENTS_CACHE_DIR)
+      path = File.join(PYGMENTS_CACHE_DIR, "#{@lang}-#{Digest::MD5.hexdigest(code)}.html")
+      if File.exist?(path)
+        highlighted_code = File.read(path)
+      else
+        highlighted_code = Albino.new(code, @lang).to_s(@options)
+        File.open(path, 'w') {|f| f.print(highlighted_code) }
+      end
+    else
+      highlighted_code = Albino.new(code, @lang).to_s(@options)
+    end
+    output = add_code_tags(highlighted_code, @lang)
+    output = context["pygments_prefix"] + output if context["pygments_prefix"]
+    output = output + context["pygments_suffix"] if context["pygments_suffix"]
+    output
+  end
+end