* passing test: responds to ping requests
* `mc.ping` - ping a server for info
* `createServer`: `options.timeout` -> `options.checkTimeoutInterval`
* `Client` emits `connect` event
* test passing: kicks clients that do not log in
* index exports `Client` and `Server`
* `createServer`: `options.keepAliveInterval` -> `options.kickTimeout`
* `Client` event `end` includes `reason` argument
- `LoginTimeout`
- `KeepAliveTimeout`
- `ServerShutdown`
* `createClient`: Set `options.keepAlive` to `false` to disable sending
keep alive packets
* `Client`: `options.isServer` defaults to `false`.