Organize js files

modified:   static/js/application.js
new file:   static/js/order_pizza.js
renamed:    static/js/application.js -> static/js/start_session.js
add ID, to all pizzas

modified:   pizza_places/chommi.py
Adds some more information into session

modified:   sessions.py
Fix problem with sending POST with selected pizza

modified:   templates/helpers/pizza_helper.jinja
Handles more functionality

modified:   pizza.py
Adds separate JS, changes icons, etc

modified:   templates/start_session.jinja
Uses separated JS files + much more forms

modified:   templates/select_pizza.jinja