1123 implement ips to ams

Changes in this branch includes: 
- implementation of itemCorrelationToke,
- implements Submission flow: IPS -> AMS (-> PAF Hub)
- Modified obtainSequenceNodeKey to remove Hub-Session prior generating the key.

This branch was tested with AMS (Nov 23 release) and PAF CERT.

BTW, for running the DIV integration demo, use the brixapp.js server (i.e. run node brixapp.js instead of make testsvr) 

@seannives , @mlippert  code review greatly appreciated =)