Support both html and json output for statuses

Site now supports status information for both HTML and JSON outputs. I added extra route `/status` that points to the same method. 

JSON will be returned at `/status.json` in the following format:

```json
{
  "status": "up",
  "services": [{
    "name": "Application",
    "description": "Main application",
    "status": "up",
    "last_update": "2012-10-24T06:05:12Z"
  }]
}
```