kindly accept simple pull request to add name to metadata.rb

berkshelf cannot upload cookbooks to the opensource chef-server unless
metadata.name exists.
Here's the bug: https://github.com/RiotGames/berkshelf/issues/442
However I believe this bug will not be fixed. No one is assigned AND no
milestone.

I've been told by a chef developer (jtimberman @ irc freenode #chef) :
"12:10 <@jtimberman> david415: we have a CHEF ticket to make it
required, but that's a breaking change, so it would be Chef 12 since we
didn't get it in time for Chef 11."