iceCandidatePoolSize: 10 makes no sense

[fippo]

https://github.com/webrtc/FirebaseRTC/blob/master/public/app.js#L13
iceCandidatePoolSize: 10,
is pretty much useless and even harmful. Remember that iceCandidatePoolSize is specifying the number of components to pre-gather so a setting of more than one usually does not make sense.

@alvestrand it would be great if you could review whether this code lab is following/promoting/teaching what is to be considered the (unwritten) BCP. See also #1