Cleanup configuration and startup

- Remove magic configuration like cqlconnection directly in modules, configure using pyramid Configurator

- Create a "cli" named caliop that configure stuff using pyramid configurator
  This ensure the application initialized always the same way, and pyramid configurator is
  really pretty and well designed to configure components. (my pov)

- Move database initialization and email account import to the cli

- Add maildir support in the cli import format