Make directory action work with Ruby 2.0

Since https://github.com/ruby/ruby/commit/f65e683ccc3b6689ac00e7c1fe0fd2c0384824b2 dot files are only listed when using `FNM_DOTMATCH`.

There are a lot of failing tests with Ruby 2.0 but the most part are related with some `FileUtils` methods becoming private for same reason that I could not find

Here an example:

```

  1) Thor::Actions::CreateLink#invoke! shows created status to the user
     Failure/Error: ::FileUtils.rm_rf(destination_root)
     NoMethodError:
       private method `rm_rf' called for FileUtils:Module
     # ./spec/actions/create_link_spec.rb:8:in `block (2 levels) in <top (required)>'

Finished in 1.45 seconds
420 examples, 1 failure

Failed examples:

rspec ./spec/actions/create_link_spec.rb:61 # Thor::Actions::CreateLink#invoke! shows created status to the user
```