CHECKPOINT Move routes out of weather_app.py into www/routes.py using Blueprint object

- Cleaner organization for application
- Show usage of Blueprints
- Same functionality as before

	modified:   weather_app/weather_app.py
	new file:   weather_app/www/__init__.py
	renamed:    weather_app/weather_app.py -> weather_app/www/routes.py
	renamed:    weather_app/templates/index.html -> weather_app/www/templates/index.html
	renamed:    weather_app/templates/location_weather.html -> weather_app/www/templates/location_weather.html
Modify form to use WTForms, with regex validation

- Doesn't do anything with nonvalid inputs yet

	modified:   weather_app/forms.py
	modified:   weather_app/www/routes.py
	modified:   weather_app/www/templates/index.html

Conflicts:
	weather_app/forms.py
	weather_app/www/routes.py
CHECKPOINT Add error messages to input form

	modified:   weather_app/forms.py
	modified:   weather_app/www/templates/index.html