Changed the way jules script works.
Moved bundle loading to a plugin, so that it can be replaced by others. :)
Changed bundle plugin to be middleware.
Here's the skeleton of a total rewrite of Jules.

The basic idea is to treat bundles in a more organized way,
and to super-emphasize "collections" of bundles by making
collections a first-class concept (queries).

I don't know whether much will be shared with Jules by the end of this.