For Review - don't merge

It also feels conceptually strange to have the only relationship between a Tasting and a Wine be through :event_wine. It's definitely nice to track the event that the wine was tasted at, but a Tasting is fundamentally a relationship between a User and a Wine, so I would say that a tasting belongs_to :wine directly. I think this will also simplify the cases in the database where you have Tastings that aren't actually associated with an event.