removed unnecessary merging of default payload in forward mode

cleaned up, test key

Merge pull request #8 from iLert/feature/consumer-improv

Fix: cross compile and readme

changelog

added option to send event message payloads directly to integration e…

…ndpoint targets

fix build

optimized shutdown of threads

fixed certificates missing in docker image

new Dockerfile for cd

switched back to env_logger 0.9 for cd