==================
* package: bump `engine.io-client`
* manager: fix `Object.prototype` extensions
* package: bump `zuul` and `zuul-ngrok`
* package: bump `debug`
* package: bump `socket.io-parser`
* package: bump `has-binary`
* remove unnecessary `index.js`
* added support for `ping` and `pong` events
* proper handling of disconnection while in `opening` state
* instrumentation / style tweaks
* added tests for same-namespace new connection handling
* do not call apply if packet id is not in acks
* build sio client with make to autogenerate new socket.io.js
* bugfix/1956 don't reuse same-namespace connections 2
* fix has-binary to work with all objects [gunta]
* bugfix/1956 don't reuse same-namespace connections
* add support for compression [nkzawa]
* fix: location.port was ignored