rails/rails — pull request #3769 by kennyj (2011-11-27 11:38:56+00:00)
Title: avoid url started with "/" for the rails.png in public/index.html

When I generated new rails app to test relative_url_root issue, I met this issue.

```
$ rails new demo
$ demo
$ (edit Gemfile)
uncommented unicorn (I want to use unicorn's --path option.)

$ bundle install

$ (edit config.ru)

require ::File.expand_path('../config/environment', __FILE__)
map ActionController::Base.config.relative_url_root || "/" do
run Demo::Application
end

$ unicorn_rails -E development --path /demo -p 3000
$ (browse http://localhost:3000/demo/)

=> I couldn't see the rails.png !
```