fulfill all GE requirements

finish all "MUST" requirements and be able to integrate with Orion via NGSI V2

update all documents to fulfill the GE requirements

In this version, we have made lots of effort to update the tutorial and other documents. This version almost fulfills the MUST requirement of full FIWARE GE.

the released version including service topology and fog function

v2.0

test the simplified deployment scripts for cloud and edges