AngularJS: Utilize ngRoute for filters

Building on #733 I added an example use of `ngRoute` to the AngularJS example. I'm not entirely convinced that we actually want to ship this, though. We have to hardcode references to the name of the controller in two different places (the view and the router setup) and have to use a workaround (injecting $route after configuring the $routeProvider) to make this work. This is necessary because ngRoute is usually used in combination with `ng-view`.

Maybe referencing this PR in the sidebar would be sufficient. WDYT?

Also cc'ing @btford for an opinion and perhaps an idea on how to improve this.