Log some interesting things about a node's lifecycle

We log for now the boot and bind events and sending the reboot action
* brokers/noop.broker: a broker that does nothing
CLI: accept a --json option in commands to read the params from a file
* app.rb: add a handler to get a node's log
Revamp the README.md; add an actual LICENSE
* bin/razor: just dump the response body when it's not JSON