Merge pull request #2026 from spohlenz/asset-tag-fix

Include TagHelper within AssetTagHelper

actionpack/lib/action_view/helpers/asset_tag_helper.rb

 require 'action_view/helpers/asset_tag_helpers/javascript_tag_helpers'
 require 'action_view/helpers/asset_tag_helpers/stylesheet_tag_helpers'
 require 'action_view/helpers/asset_tag_helpers/asset_paths'
+require 'action_view/helpers/tag_helper'
 
 module ActionView
   # = Action View Asset Tag Helpers
@@ -191,6 +192,7 @@ module Helpers #:nodoc:
     #   RewriteEngine On
     #   RewriteRule ^/release-\d+/(images|javascripts|stylesheets)/(.*)$ /$1/$2 [L]
     module AssetTagHelper
+      include TagHelper
       include JavascriptTagHelpers
       include StylesheetTagHelpers
       # Returns a link tag that browsers and news readers can use to auto-detect