Added function base64 to encode strings using base64 encoding.

util/lib/puppet/parser/functions/base64.rb

@@ -0,0 +1,8 @@
+
+require 'base64'
+
+module Puppet::Parser::Functions
+    newfunction(:base64, :type => :rvalue) do |args|
+        Base64.encode64(args[0])
+    end
+end