Create addressbook_send.rs
Create addressbook_send.rs

Demonstrates using the `TypedReader` (and `OwnedSegments`) of https://github.com/capnproto/capnproto-rust/issues/50 to communicated Cap'N Proto messages across threads.
placrosse/capnproto-rust,dwrensha/capnpc-rust,tempbottle/capnproto-rust,dwrensha/capnproto-rust