Response parsing into Coproduct for more than one parameter.
Started working on MessageHandlers (Remove and Contains implemented).
Handle result subtyping in Handler.
Nicer handling of unrunnable Handlers.
More fluent interface.
Coproduct Remove only on type-level.
Add handleTyped. In some cases this allows for a nicer syntax.
Implement Handler.run.
Add example for handler.
Add ActorIntegration.handle.