Add Guardfile
Refactor observers and action name termination

Sorry for not breaking this up into smaller changes.

* Terminate action_name early, they do not leak into actions anymore
* Reorder arguments to actions from persistend to transient
  request, env is now env, request
* Remove Substation::Event observers directly receive responses and can
  delegate as they like
* Drastically nuke LOC ;)

Not finished, eating own dogfood before next iteration.
Merge pull request #2 from mbj/master

Refactoring of observers