Sentinel Proxy version 1.4

Added
* Sending status messages to server
* Error messages

Removed
* Data compression

Sentinel-proxy version 1.3.1

Added
* Testing proxy - moved from Minipots repository
* CHANGELOG

Changed
* Complete code refactoring - replace `zpoller` by `zloop`

Implement crc check for device token

Fix segfault caused by MQTT handling

Implement device token

Fixup release

Initial release