Echo JS 0.11.0

So now we need sticky load-balancing ? :/ 
The cluster module will not gonna be very usefull now

http://socket.io/blog/introducing-socket-io-1-0/#scalability

Seems pretty good, and faster than the previous version, but:

- Changed some things (method names, and so on) with no reason
- It's not possible to use a custom logger anymore
- I can't access the list of rooms anymore (or it changed and they didn't documented it yet)