v0.17.0

refacto (no new features)

• a lot simpler (remove the orchestrator loop : hrclient exchanges only with hrprocess ... there is'nt anymore a orchestrator to drive things)
• better start & stop server (and now fully gunicorn compliant (reboot ok) ... but avoid with "--preload")

Remarks:

• tag.update(ws) still not reconnect after f5/refresh ;-(

Full Changelog: v0.16.2...v0.17.0