add an obfuscating turn single page sample app

This adds a demo which is identical to the turn sample except that it obfuscates each message sent between the turn and net modules. I think it should prove useful.
Quite right. I meant to configure this identically to the copypaste's sample (https://github.com/uProxy/turn-relay/pull/20). Done. Thanks! (eventually the copypaste sample will disappear, leaving just one config for us to worry about)