Allow binding to specific interface addresses

https://trello.com/c/aWazKGQc/404-allow-binding-to-specified-ip-address
I'm not sure what you mean. I was just saying that if extra care was needed I could make the backend code deal with empty strings either in ConfigFileProvider or UrlAclAdapter. This would provide an option in case someone has a bad bind address, they can just blank it out instead of needing to put * back.