rick/balder — pull request #1 by rick (2013-11-15 03:18:56+00:00)
Title: fix problem with missing cache_dir, causing nil to String conversion error

Specifically, this in the logs:

```
TypeError (no implicit conversion of nil into String):
app/controllers/photos_controller.rb:80:in `create'
app/middleware/flash_session_cookie_middleware.rb:16:in `call'
```