I'm following suit here with the convention so far to handle these errors (https://github.com/jbenet/webrtc.io-client/blob/944fd60a8952bf1a72d379820933658f0e82b41a/lib/webrtc.io.js?#L283-287). 

Happy to switch to `console.log`, but it seems to go counter what the rest of the file does. This is the same kind of error as when a user calles `rtc.createStream` without WebRTC support, or if the stream connection fails.