rails/rails — pull request #12622 by timsly (2013-10-24 05:05:35+00:00)
Title: pass app config to controller helper proxy

After this fix application config become available when calling helper outisde of view

config/application.rb
```ruby
#...
config.asset_host = 'http://mycdn.com'
#...
```

Somewhere else
```ruby
ActionController::Base.helpers.asset_path('fallback.png')
# => http://mycdn.com/assets/fallback.png
```