jnicklas/carrierwave — pull request #642 by ndgiang84 (2012-03-03 12:29:39+00:00)
Title: Fixed root path in uploader.rb in order to work correctly Rails 3.2.2

Recently I upgrade Rails to 3.2.2 and got the error

```ruby
TypeError: can't convert nil into String
```
when I finish uploading and try to get the file path (job.app_url for example)

`root` seems to be nil, `CarrierWave.root` seems to work.