Console

* [x] Add `/console` websocket endpoint
* [x] Add console UI on /index.html
* [x] Add some authentication process to `/console`
* [x] `Connection` event;
* [x] `Disconnection` event;
* [x] `Subscribed` event;
* [x] `Unsubscribed` event;
* [x] `API message` event;
* [x] `Client Event message` event;

Preview:

![screen shot 2014-04-11 at 6 11 35 pm](https://cloud.githubusercontent.com/assets/30873/2676734/636192f8-c140-11e3-9cb6-43fdd1889a4f.png)