Update lib to socket.io 2.0.x

[ageapps]

While using socket.io-nats with socket.io version 2.0.0 i get this error:

/app/node_modules/socket.io/lib/socket.js:247
  this.adapter.addAll(this.id, rooms, function(err){
               ^
TypeError: this.adapter.addAll is not a function
    at Socket.join (/app/node_modules/socket.io/lib/socket.js:247:16)
    at Socket.onconnect (/app/node_modules/socket.io/lib/socket.js:302:8)
    at /app/node_modules/socket.io/lib/namespace.js:175:16
    at _combinedTickCallback (internal/process/next_tick.js:131:7)
    at process._tickCallback (internal/process/next_tick.js:180:9)

Its seems to be related o socket.io's version, when using it with version 1.4.5 (the same in the dependencies) it works perfectly fine.

This adapter seems to be pretty usefull in order to scale socket.io backends using NATS, it would be great to release a version supporting socket.io 2.0.x versions.

[dash042]

I second this issue!!