mikel/mail — pull request #747 by grosser (2014-07-22 05:30:58+00:00)
Title: silence warning

@bf4

```
spec/mail/network/delivery_methods/file_delivery_spec.rb:89: warning: File.exists? is a deprecated name, use File.exist? instead
spec/mail/network/delivery_methods/file_delivery_spec.rb:74: warning: File.exists? is a deprecated name, use File.exist? instead
```