Release 0.1.1

Added

• and_then and BagageHandler these allow manipulation of bags in containers such as DiplomaticBag<Vec<T>> -> Vec<DiplomaticBag<T>> conversions.
• transpose for DiplomaticBag<Result<T, E>> and DiplomaticBag<Option<T>> producing Result<DiplomaticBag<T>, DiplomaticBag<E>> and Option<DiplomaticBag<T>> respectively.