Update Vendored Erubis to 2.6.6

vendor/plugins/erubis/test/data/users-guide/fasteruby.rb

@@ -0,0 +1,11 @@
+require 'erubis'
+input = File.read('fasteruby.rhtml')
+eruby = Erubis::FastEruby.new(input)    # create Eruby object
+
+puts "---------- script source ---"
+puts eruby.src
+
+puts "---------- result ----------"
+context = { :title=>'Example', :list=>['aaa', 'bbb', 'ccc'] }
+output = eruby.evaluate(context)
+print output