define name attr, required by Berkshelf/Ridley.

[justizin]

Without the 'name' attribute in metadata.rb, I get this problem running Berkshelf:

   Resolving cookbook dependencies with Berkshelf 3.2.4...
>>>>>> ------Exception-------
>>>>>> Class: Kitchen::ActionFailed
>>>>>> Message: Failed to complete #converge action: [The following error occurred while reading the cookbook `leiningen':
Ridley::Errors::MissingNameAttribute: The metadata at '/var/folders/lt/lytf10857vg08qy8x_cznyxcg_gv9r/T/d20150901-2134-1o0ebtm' does not contain a 'name' attribute. While Chef does not strictly enforce this requirement, Ridley cannot continue without a valid metadata 'name' entry.]
>>>>>> ---------------------- 
>>>>>> Please see .kitchen/logs/kitchen.log for more details
>>>>>> Also try running `kitchen diagnose --all` for configuration

With the change in this pull request, the problem goes away.