stopped SteamId#fetch_games from caching an empty hash in @games when an error is raised while parsing "#{base_url}/games?xml=1"
Merge pull request #6 from JohnAmican/dont-cache-empty-games-hash-on-503

stopped SteamId#fetch_games from caching an empty hash in @games when an error is raised while parsing "#{base_url}/games?xml=1"