def find(name, version = nil)
      possibles = _cookbooks[name]
      return nil if possibles.nil?

      version ||= possibles.keys.sort.last
      possibles[version]
    end
def find(name, version = nil)
      possibles = _cookbooks[name]
      return nil if possibles.nil?

      version ||= possibles.keys.sort.last
      possibles[version]
    end
Determine if the cookbook store contains a cookbook. If the version
 attribute is nil, this method will return the latest cookbook version by
 that name that exists. If the version is specified, this method will only
 return that specific version, or nil if that cookbook at that version
 exists.

 @param [String] name
   the name of the cookbook to find
 @param [String, nil] version
   the version of the cookbook to search

 @return [CommunityZero::Cookbook, nil]
   the cookbook in the store, or nil if one does not exist