Add generic overload/extension method for MvcOptions.Filters.AddService<FilterType>

We should add an extension method to `MvcOptions.Fiters` that allows adding a service-based filter type via a generic argument, e.g.:

``` c#
services.AddMvc(options =>
        {
            options.Filters.AddService<RequireLoginFilter>();
        });
```

@rynowak @davidfowl