Add script/rubyprof to generate cachegrind callgraphs

script/rubyprof

@@ -0,0 +1,18 @@
+#!/usr/bin/env bash
+export BENCHMARK=1
+
+TEST_SCRIPT="Jekyll::Commands::Build.process({'source' => 'site', 'full_rebuild' => true})"
+
+RUBY=$(cat <<RUBY
+  require 'ruby-prof'
+  result = RubyProf.profile{ ${TEST_SCRIPT} }
+  printer = RubyProf::CallTreePrinter.new(result)
+  filename = "tmp/ruby_prof_#{rand 10000}"
+  puts "Writing profile to #{filename}"
+  file = File.open(filename, "w")
+  printer.print(file, {})
+  file.close
+RUBY
+)
+
+bundle exec ruby -r ./lib/jekyll -e "${RUBY}"