add min/max versions to scaffolding requirements.txt
reorganize manage command defs
Now using PyJade templates on top of Jinja:
- Converted all html templates to Jade
- Added a navbar with a simple menu and log in/out buttons (see boilerplate.jade)
- Improved the Login/Register templates (see also overholt.css and users/forms.py)
add an about page
fix boilerplate include path for flashed messages