Switch over to the extended handshake mechanism.
Update opcodes, closure and broadcast.
Update req/rep scheme to new relay protocol.
Polish bcast and pub/sub comments a bit.
Update tunnel implementation for relay v1.0-draft2
Fix allowance and sync bug.
Update readme with protocol features.
Add chunk size check and drop if over limit.
Wait for scheduled messages to complete on close.
Fix tunnel overload handling.
Allow client-only connections to the Iris overlay.
Fix migrated import paths.
Fix tests for req/rep errors and tunnel chunking.
Partially graceful relay close.
Fix #30: lingering tunnels.
Fix #29, memory leak caused by unreleased refs.
Fix #39, though should be tested more thoroughly.
Don't return a tunnel fault on clean remote close.
Fix previous half save.