setting Socket.IO to log: false causes total failure in Manager.js

[perezd]

L61 specifies that one can completely disable logging by setting the option log: false, upon doing so, Socket.IO will throw an exception about L116: this.log.info('socket.io started');

This is due to L140: if (this.disabled('log')) return;

this.log is undefined now, and undefined does not respond to info

[perezd]

current work around is set "log level": -1