Routing: add doc comment for controllers_factory
Config: add comments into config files
add default controller, template file
Service: add UrlGenerator
Service: add Monolog
Twig: sync debug option with application
Twig: enable caching
Service: add Swift Mailer
Config: load service config from app/bundle-level config
Config: move parameter config into parameters.php
Config: fix comment for including bundle config(s)