Fix error template so it properly outputs the busted task.
Significant refactor / cleanup.

* start / stop server can now be called from the directory in which the biscuit lives for convenience.
* re-architect server layer a bit more by encapsulating the bulk of it within the Biscuit class and using the APIs it offers. This has the advantage of making consistent APIs accessible to other portions of the biscuit library and will ultimately be more testable.
* Remove scaffold, to be replaced by external fetch of "recipe".  This is currenly WIP and broken.