Update README.md

Added an informative README.MD file, as per discussion with Dieter.
Update README.md

Add information about Ubuntu dependencies.
PZH system tests

Jira Issue: WP-1069
Update pzh_provider.js

Debugging
Update pzh_provider.js
Merged to latest master

Jira Issue : WP-123
Certificate validation

Jira Issue: WP-123
PZH sync handling

- PZH updates other PZP about sync update when updated by 1 PZP
- PZP service cache handling
- PZH - PZH sync handling, (though after being synced, when updated by PZP, PZH does not sync with PZH)

Jira Issue: WP-1024
Pzh-Pzh connection optimization

Jirs Issue: WP-1024
Improved PZH-PZH connection

Jira Issue: WP-1024
Trigger to connect other pzh changes

connection towards other pzh is triggered when message is destined for that device.

Jira Issue: WP-1024
Connection handling improvement

Jira Issue: WP-1024
Store signed certificate separately and sync across PZ

Jira Issue: WP-1024
PZH triggering connection towards PZP

Jira Issue: WP-1024
Merge branch 'WP-1024-conn-opt' of https://github.com/habibvirji/webinos-pzh into WP-1024-conn-opt

Conflicts:
	lib/pzh_pzpEnrollment.js
	lib/pzh_sendMessage.js
	lib/pzh_syncHandler.js