Merge pull request #123 from amatsuda/drop_legacy

Drop legacy support

Author: rafaelfranca

lib/sprockets/rails/helper.rb

@@ -38,15 +38,8 @@ def initialize(source)
         end
       end
 
-      if defined? ActionView::Helpers::AssetUrlHelper
-        include ActionView::Helpers::AssetUrlHelper
-        include ActionView::Helpers::AssetTagHelper
-      else
-        require 'sprockets/rails/legacy_asset_tag_helper'
-        require 'sprockets/rails/legacy_asset_url_helper'
-        include LegacyAssetTagHelper
-        include LegacyAssetUrlHelper
-      end
+      include ActionView::Helpers::AssetUrlHelper
+      include ActionView::Helpers::AssetTagHelper
 
       VIEW_ACCESSORS = [:assets_environment, :assets_manifest,
                         :assets_prefix, :digest_assets, :debug_assets]

lib/sprockets/rails/legacy_asset_tag_helper.rb

@@ -128,10 +128,8 @@ def configure(&block)
       Sprockets::Rails::Helper.raise_runtime_errors = app.config.assets.raise_runtime_errors
 
       if config.assets.compile
-        if app.routes.respond_to?(:prepend)
-          app.routes.prepend do
-            mount app.assets => config.assets.prefix
-          end
+        app.routes.prepend do
+          mount app.assets => config.assets.prefix
         end
       end
     end