Merge pull request #116 from amatsuda/lazy_load_action_view

Bring back action_view lazy loading

Author: rafaelfranca

lib/sprockets/rails/task.rb

@@ -1,6 +1,7 @@
 require 'rake'
 require 'rake/sprocketstask'
 require 'sprockets'
+require 'action_view/base'
 
 module Sprockets
   module Rails

lib/sprockets/railtie.rb

@@ -83,7 +83,7 @@ def configure(&block)
         app.assets.append_path path
       end
 
-      ActionView::Base.instance_eval do
+      ActiveSupport.on_load(:action_view) do
         include Sprockets::Rails::Helper
 
         # Copy relevant config to AV context