Add peer-to-peer commenting back to Java!

In the latest snapshot, the feature to join your friend's worlds seems to have been removed. My sources say, though I have not seen the information personally, claims that Mojang says the feature is simply not what they wanted for players. But consider this, THE PLAYERS WANT IT! We really dont care if it isn't ready and needs some work. Let us have it. We really dont care if it isn't what you wanted the experience of that feature to be. Work out the kinks later, we want our multi-player back!