Remove creeped :focus tag

This can't be good :/
Raise a MissingNameAttribute
Update API in #upload
Merge pull request #258 from RiotGames/sethvargo/require_name

Require 'name' in metadata.rb
Remove broken error name

I am not sure where this error came from or why it no longer exists
Merge pull request #259 from RiotGames/sethvargo/missing_errors

Remove broken error name