rails/rails — pull request #7472 by kennyj (2012-08-28 18:06:46+00:00)
Title: Fixes AP isolated test. Rails::Railtie is required when loading dalli.

I saw the following error in travis's log.

```
1) Failure:
/home/vagrant/builds/rails/rails/actionpack/test/dispatch/session/mem_cache_store_test.rb(TestIsolated) [/home/vagrant/builds/rails/rails/actionpack/test/ts_isolated.rb:12]:
```

According to my investigation, I think dalli requires rails/railtie. But when testing (isolated), we don't load 'rails/railtie'