refactor code that updates user account preferences into user model,
refactor code that filters todos by tag into user model, add __repr__ to
model classes 'Tag' and 'TodoItem' to support working with IPython,
added IPython session as docstring to next test class
pin pyramid_deform in requirements.txt to version 0.2
create several FormViews based on pyramid_deform helper class to break
up big large existing view that handles everything, form views use
SQLAlchemy models to change application state, move todoitem.due_date
timezone conversion into existing SQLAlchemy domain models - TDB in
todogrid, add new XHR route for todos to support AJAX-based loading of
todo into modal task form, change URL generation to use route
configuration, revisited inclusion of deform JS/CSS dependencies into
global template, include pyramid add-ons from paster configuration
files, all tests pass
small changes to README