[RFC] Ship XBMC without weather addon

since @theuni mentioned WU is not happy with our current agreement, we need to find a way to reduce the load we put on their service.
i'd like to propose to ship XBMC without the wunderground addon. it will still be available as an optional download through our addon repo, for those interested in having weather forecasts in their media center.

if we insist on shipping XBMC with a default weather service, we'll have to look for another provider.
yahoo weather 'might' be an option. afaik they provide free and unlimited access to their weather api.

thoughts?