Move navigation code into WinningJS

[pbouzakis]

Currently navigation logic is inside the App component. Please move it into WinningJS.

[pbouzakis]

From Domenic: Do we even need/use the WinJS navigation framework? It's useful for something, right?

[pbouzakis]

I think if we use the routing "#/todo-list", then we will probably don't really have to use it, however it is nice for the added nav.back, and possibly other helpful methods (the fact that we do have a saved history may be one reason to keep it).

As long as it's easy to use, I say we keep it for now.

[domenic]

In progress, see YuzuJS/WinningJS#10