Alpha v0.6 Release — Gossip protocol (node to node communication strategy)

Successful integration and layered v0.6 (gossip protocol (node to node communication process) -  (https://en.wikipedia.org/wiki/Gossip_protocol) meaning it sets up Tangram for v0.7.

For those who have access to #alpha-06-testers you'll notice the following have been exposed under "fabric" heading:

Members
Members command outputs the current list of members that an agent knows about, along with their state.

Status
Status command is used to obtain operator debugging information about the running agent.

Coordinate
Coordinate command is used to obtain the network coordinate of a given node.

Write-up of the protocol will be shared once v0.7 is released. Couple of things we're going to touch-base on:

1. Basic concepts of the gossip protocol
2. Scalability of the protocol
3. How nodes communicate and exchange data
4. Failure detection mechanism
5. Security model within the gossip protocol
6. Pros, cons & mitigation strategy