Set rails engine root

Index: ruby-rails-assets-favico.js/lib/rails-assets-favico.js.rb
===================================================================
--- ruby-rails-assets-favico.js.orig/lib/rails-assets-favico.js.rb
+++ ruby-rails-assets-favico.js/lib/rails-assets-favico.js.rb
@@ -26,6 +26,7 @@ module RailsAssetsFavicoJs
   if defined?(Rails)
     class Engine < ::Rails::Engine
       # Rails -> use app/assets directory.
+      config.root='/usr/share/ruby-rails-assets-favico.js'
     end
   end