Refactor to always send acks periodically.
Add Chicago logging.
Refactor for ease of client/server split.
Add a preliminary curvecp server.
Lots more updates for pynacl curvecp.

 * Add curvecp addresses.
 * Pass addresses to factories properly.
 * Drop the initial message rate to 0.
 * Add server dispatchers for real servers.
 * Make the transport implementations more robust to bad packets.
 * Fix periodic acks.
 * Properly convert to/from DNS format for domain names.