Moved DataAction, AppbaseRequest, etc into handy-play
Simplify Ref.toFuture, Ref.toFutOpt, Ref.onComplete, and enumerate methods from RefConversions
handy-user now provides default classes as well as traits for User, Identity, PasswordLogin
Ids.lookUp takes a LookUp not LookUpMany. Added convenience methods around Option[Id] and RefMany[Id]
Removed implicit writers for Id and RefWithId (as they tend to be needed in non-DAO classes as well, and it caused issues with implicit resolution)