Update engine definition

Isolate engine to Refinery
add engine name
Add initializer to register engine with Refinery
Rename plugin init initializer to be more descriptive
Update plugin initializer to conform to latest master of RefineryCMS

lib/refinery/blog/engine.rb

@@ -1,23 +1,32 @@
+require 'rails_autolink'
+      
 module Refinery
   module Blog
     class Engine < Rails::Engine
-      require 'rails_autolink'
+      include Refinery::Engine
+
+      isolate_namespace Refinery
+      engine_name :refinery_resources
       
       config.to_prepare do
         require 'refinery/blog/tabs'
       end
 
-      initializer "init plugin", :after => :set_routes_reloader do |app|
+      initializer "register refinerycms_blog plugin", :after => :set_routes_reloader do |app|
         Refinery::Plugin.register do |plugin|
           plugin.pathname = root
           plugin.name = "refinerycms_blog"
           plugin.url = app.routes.url_helpers.refinery_admin_blog_posts_path
           plugin.menu_match = /^\/refinery\/blog\/?(posts|comments|categories)?/
           plugin.activity = {
-            :class => Refinery::BlogPost
+            :class_name => :'refinery/blog_post'
           }
         end
       end
+      
+      config.after_initialize do
+        Refinery.register_engine(Refinery::Blog)
+      end
     end
   end
 end