Use internal Meteor._Stream instead Pub/Sub

[arunoda]

Current implementation uses Pub/Sub and a Method to mimic a Stream. It is not anything bad.

But it will great if we can use the underline Meteor._Stream[1] as the transport.

[1] - http://stackoverflow.com/a/16703770/457224

[YuukanOO]

I just released a package which use the internal meteor stream to do real time communication, see https://github.com/YuukanOO/streamy in case anyone is interested.