Adds JSDoc to the Application.

Still a WIP, but this adds JSDoc to the Application source.

I've never used JSDoc before, so feel free to give me feedback on the methods and properties that I've already added.

Thanx
```
@param {String} requestName - The name of the request.
@param {} [args...] - Additional arguments to pass to the response callback.
@returns value returned by the request.
@public
```