Mostly daemons refactoring

Few UI fixes, a typo in readme and mostly daemons refactoring.

Daemons now stop gracefully when catching signals and KeyboardInterrupts and are a lot more verbose in the logs.
Logging is now using 'logbook' to be easier and supports multiple logging levels.  

edit : please do not auto-merge (the pull request is so someone checks my code before the merge)