Servatrice password authentication

Implements #290, and adds a lot of nice comments to servatrice's example configuration file.
Depends on #353 
Just tested this, and yes it is possible but....
A user can only be logged into a single server that is sharing the db until the sessions table information is cleared in the even the user does not properly log out.  So run all the servers you want connecting to a single DB but users will only be allowed to connect to a single server sharing the same DB.  Don't confuse sharing DB information with the ISL code concept were servers share there user / chat / game information amongst one another allowing for cross server communication.