Add signalr packages and example shared service that is injected into th...

...e OWIN host container and that is then subsequently injected into Nancy's and SignalR's containers.

There are 3 containers of interest - WebApplication's, SignalR's and Nancy's. Here we have an IExampleSharedService that is passed into all three. If you wanted to, you _could_ have a single over-arching application container (TinyIoC, AutoFac, Ninject etc) and replace the built-in ones of each framework. My personal preference is to keep them separate so I explicitly know what each component needs when I look at the Startup class.