Python-engineio-v3

- Workaround to prevent the "exception never retrieved" asyncio bug [48](https://github.com/miguelgrinberg/python-engineio/issues/48) ([commit](https://github.com/miguelgrinberg/python-engineio/commit/dab2d2e9fd33896bbbb772b18323574ddc1b8ce5))

- Handle buggy and correct encodings for engine.io unicode packets [102](https://github.com/miguelgrinberg/python-socketio/issues/102) ([commit](https://github.com/miguelgrinberg/python-engineio/commit/efc341ab321209007bddd75333c48d4e74527d53))

- be a bit more forgiving with socket timeouts ([commit](https://github.com/miguelgrinberg/python-engineio/commit/05da51a41d4a1a7a08e5f19194a248923780fff8))

- fixed typo ([commit](https://github.com/miguelgrinberg/python-engineio/commit/30445b239227daf88290a972349ba01cd31bd525))

- another fix in the lost connection detection logic ([commit](https://github.com/miguelgrinberg/python-engineio/commit/73ac2ea7791b79a01974a1ebdb97104f99c1d7a7))
- detect lost connections (asyncio) ([commit](https://github.com/miguelgrinberg/python-engineio/commit/9a96896bbda37613bd8b29ac658427366e5d49be))
- detect lost connections (eventlet/gevent) ([commit](https://github.com/miguelgrinberg/python-engineio/commit/e9a3161fdcb7767d77a2370d003f4e74ef3ecd1d))

- properly handle crashes in connect/disconnect handlers ([commit](https://github.com/miguelgrinberg/python-engineio/commit/5b24410016f334e739690438345782fb5dcece02))
- invoke disconnect handler when websocket handler crashes ([commit](https://github.com/miguelgrinberg/python-engineio/commit/f772cf62193e0dcc8be43814c1bfda7b987a2a15))
- invoke disconnect handler when application handler crashes ([commit](https://github.com/miguelgrinberg/python-engineio/commit/246edc3e84bce055284936745023ed4491897a5b))