Revert "Revert "concat should check the input if escape or not using …

…SafeBuffer concat method""

This reverts commit 4cee99a.

Signed-off-by: Jeremy Kemper <jeremy@bitsweat.net>

lib/rails_xss_helper.rb

@@ -31,6 +31,15 @@ def link_to(*args, &block)
 
 module ActionView
   module Helpers
+    module TextHelper
+      def concat(string, unused_binding = nil)
+        if unused_binding
+          ActiveSupport::Deprecation.warn("The binding argument of #concat is no longer needed.  Please remove it from your views and helpers.", caller)
+        end
+
+        output_buffer.concat(string)
+      end
+    end
     module TagHelper
       private
         def content_tag_string_with_escaping(name, content, options, escape = true)