added CoolQueue.io

This is a library I built and use since yesterday, you can find it at https://github.com/peterwilli/CoolQueue.io
The idea is that CoolQueue will intercept and save any requests to the server that have been made using socket.io while the user is offline. When the user is back online we send and empty the queue. All with little to no change in your original code :)

The dependency is JStorage (https://github.com/andris9/jStorage)