Cloudio-endpoint-python

Implemented enhancements:
- Logging now version info at startup

Fixed bugs:
- Updated MqttAsyncClient's `disconnect()` method. Added `force_client_disconnect` parameter

Fixed bugs:
- Forcing to close MQTT client connection in case there is a problem during connection time

Fixed bugs:
- Now continuing to connect to cloud.iO even on error

Fixed bugs:
- Fixed problems with str und byte representations

Implemented enhancements:
- Improved Python 3 compatibility
Fixed bugs:
- Fixed bug in client's `publish()` method when connection was not
already established