Add name attribute to metadata

When using vagrant-chef-zero, provisioning fails because the `name` attribute is missing from the metadata:

```
/Users/james/.vagrant.d/gems/gems/ridley-3.1.0/lib/ridley/chef/cookbook.rb:44:in `from_path': The metadata at '/Users/james/Sites/chef/cookbooks/chef-scout' does not contain a 'name' attribute. While Chef does not strictly enforce this requirement, Ridley cannot continue without a valid metadata 'name' entry. (Ridley::Errors::MissingNameAttribute)
```