(connection): handling change in sessionId

[rt2zz]

right now there is a bug in the connection registry that if sessionId changes the registry is never updated, since it is only set upon initial connection: https://github.com/rt2zz/edonode/blob/master/index.js#L211

We have two options to solve

1. require a new connection anytime sessionId changes
2. listen for sessionId change upon every invocation, and update registry upon change

I am leaning towards option 2 but would like to discuss the pros/cons first.