bake: Optimize cache handling for the baking process. - Get rid of the 2-level pipeline runs... handle a single set of passes. - Go back to load/render segments/layout passes for pages. - Add descriptions of what each job batch does. - Improve the taxonomy pipeline so it doesn't re-bake terms that don't need to be re-baked. - Simplify some of the code.

syntax: glob
*.pyc
*.egg-info
.cache
__pycache__
venv
tags
bower_components
node_modules
build/lib
build/bdist*
util/messages/_cache
util/messages/_counter
dist
docs/_cache
docs/_counter
_docs-counter
foodtruck/static
piecrust.egg-info
piecrust/__version__.py
tests/__tmpfs__
.ropeproject