(- fix API) Thing.toArray: discard noughty
(new API) Implement Thing#inject
(fix lib) Execution#clone: Clone locals as well
(- fix) Repair debugging-instance construction
(- new API) Make all Things into EventEmitters
(- new debug) Clean TRACE_REACTOR output up

Conflicts:
	Source/reactor.coffee
(new API) Emit 'flush' event on empty-queue
(- meta doc) Add some TODOs for the executable
(- fix tests) Only listen for flushed once
(- new debug) Add debugging-output to 'flush' event
(!! new) Implement basic Rulebook support

I've been working with Devyn on a "RubySpec-ish" framework for maintaining implementation parity and encouraging / easing new implementation work. This is a first-stab at implementing support for these 'rules' in the reference impl.
(new CLI) Add a `check` operation for Rulebooks