Demo3 work not correctly

[broderix]

or see youtube video
https://www.youtube.com/watch?v=fn817WgF1c8

[gritzko]

#36

That was a bug in the protocol, actually.
The state snapshot message was inconsistently defined. That only surfaced in multi-level configurations (like with a proxy server). This demo has a multi-level config (proxy in the parent iframe, clients in child iframes).
Fixed in 1.0.