Add example of query string parameters for routes

[brandonroberts]

There aren't any examples of using query string parameters for primary/nested routes. Issue brought up here: angular/angular#6204 (comment)

@Component({...})
@RouteConfig([
    { path: '/', component: HomeComponent, name: 'Home' }
])
class AppComponent {
}

@Component({...})
class HomeComponent {
    constructor(params: RouteParams) {
        let id = params.get('id'); // id == 12345
    }
}

    <a [routerLink]="['/Home', {id: 12345}]">Home 12345</a> <!-- will navigate to /?id=12345 -->

[wardbell]

Coincidentally, I just added "Milestone 4: Query Strings" in PR #637

Closed by PR #637.