Akka style 'tell' for fire-and-forget async messaging

[stevehayles]

Awesome library, I look forward to the re-write in version 0.10. In other actor frameworks it's a frequently used pattern to use an async fire-and-forget pattern. Akka uses 'ask' and 'tell' for a send type method that returns a response and the corresponding async pattern.

This is clearly a very fast framework that doesn't actually use message passing locally but in a remote / foreign setup serialization overheads will slow things down and it's often the case that an actor does not need a response. I'd love to see similar functionality added here ?