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
* installers/microkernel/boot.erb: remove inadvertently added local URL

iPXE becomes very slow downloading if the Content-Length header isn't set.
Unless people use a patched Sinatra though, they are bound to see very slow
downloads.

See https://github.com/sinatra/sinatra/issues/739 for details
* README.md: add references to Nick's blog and puppetconf talk

These were left out inadvertently in redoing the README.
* README.md: fix links into Wikis