Changes behavior from only opening sockets when absolutely necessary to
keeping them open for as long as possible. Key differences:
- Much higher success rate for messages sent from the connected server.
- Process no longer shuts down if nothing is done with gun, instead
listens for incoming messages on client sockets.
Socket reconnect handle by Peer instances, meaning better handling for
deferred messages and predictable backoff.
The client.js logic has been significantly refactored. Among the
improvements, GET/PUT requests now respect the `peers` option for each
gun instance, only sending requests to the URLs listed.
The Peer "class" now extends EventEmitter. Listening to any websocket
events (e.g., "message", "close", "open", etc.) will not only subscribe
to the current websocket, but all future websockets. This provides a
much needed abstraction, since reconnection replaces the socket, which
would typically destroy your listeners.
