Fix tests, add applications to eager loading/cache for statuses, fix

application website validation, don't link to app website if website isn't set,
also comment out animated boost icon from #464 until it's consistent with non-animated version

config/application.rb

@@ -46,6 +46,7 @@ module Mastodon
 
     config.to_prepare do
       Doorkeeper::AuthorizationsController.layout 'public'
+      Doorkeeper::Application.send :include, ApplicationExtension
     end
 
     config.action_dispatch.default_headers = {