A command-line options for notary

[netsafe]

We do have some hardcode, lads! It's useful most of the time, but let we add something like this :

• --bind-address | -i - An IP address to bind on. Hardcoded 0.0.0.0 is too WIDE =)
• --memcache-host | -mh - An address for memcached
• --memcache-user | -mu - memcached username
• --memcache-password | -mp - memcached password
• --redis-url | -ru - redis url if not default

Just for reference : it's an enhancement, not a critical error