New UI changes(tags, categories, authorisations, module index…)

To run:
  - ruby lib/remove_old_tags.rb DB_NAME
  - rake new_ui:migrate_tags
  - rake new_ui:migrate_categories['APP_KEY,''MODEL_NAME'] (check new_ui.rake for more details)

vendor/built_in_modules/page_content/init.rb

@@ -11,6 +11,8 @@ module PageContent
     intro "I am intro"
     update_info 'some update_info'
 
+    authorizable
+
     front_end do
       app_page 'page_contexts' do 
         frontend_i18n "page_content.frontend.page"