Zdm-client-py

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* Fix import pyJwt

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Official release of ZDM (Zerynth r2.6.0)
* Added conditions and removed events.
* Added requests_timestamp() method
* Renamed publish_data() into publish().
* Fix job args after expected status received.
* Renamed jobs parameters into jobs_dict of the ZDMClient.
* Parameters of publish(payload, tag) methods inverted. First parameter is payload and second is tag.

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* Added Conditions and removed the events.
* removed wait_for_publish()

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* added wait_for_publish() to the published msg in order to guarantee that the message is sent to the ZDM
* added the send_event() method for sending events to the ZDM.

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* fix json load arguments of job

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* Changed default endpoint to "mqtt.zdm.zerynth.com"
* Fix args of Jobs as ./json