tzinfo/tzinfo — pull request #14 by hsbt (2014-02-09 07:20:12+00:00)
Title: use File.exist? instead of File.exists?

Ruby 2.1.0 warned follow message:

```
/path/to/tzinfo/test/test_utils.rb:50: warning: File.exists? is a deprecated name, use File.exist? instead
```

I fixed it.