Update Vendored Erubis to 2.6.6

vendor/plugins/erubis/test/data/users-guide/example6.rb

@@ -0,0 +1,12 @@
+class MyData
+  attr_accessor :val, :list
+end
+
+## any object can be a context object
+mydata = MyData.new
+mydata.val = 'Erubis Example'
+mydata.list = ['aaa', 'bbb', 'ccc']
+
+require 'erubis'
+eruby = Erubis::Eruby.new(File.read('example5.eruby'))
+puts eruby.evaluate(mydata)