Log the client ip on pad access

Establishes a new logger `'access'`, that's used to log relevant information to the console when a users enters or leaves a pad, ie. the users ip address and the pad they enter.

I also changed the log level of all messageLogger messages to `'debug'`, which would probably also be a reasonable change for the http logger.

This fixes #1399 -- In order to just log pad access you'll need to change your log4js config in the settings file.