Fix for 'Unknown Provider' error that occurs in steps 10 & 11

When running the code for steps 10 & 11 the following error is displayed:
```Javascript
Uncaught Error: [$injector:modulerr] Failed to instantiate module phonecatApp due to:
Error: [$injector:unpr] Unknown provider: $routeProvider
http://errors.angularjs.org/1.2.0-rc.2/$injector/unpr?p0=%24routeProvider
    at http://localhost:8000/app/lib/angular/angular.js:78:12
    at http://localhost:8000/app/lib/angular/angular.js:2997:19
    at getService (http://localhost:8000/app/lib/angular/angular.js:3119:39)
    at Object.invoke (http://localhost:8000/app/lib/angular/angular.js:3140:13)
    at http://localhost:8000/app/lib/angular/angular.js:3078:37
    at Array.forEach (native)
    at forEach (http://localhost:8000/app/lib/angular/angular.js:224:11)
    at loadModules (http://localhost:8000/app/lib/angular/angular.js:3065:5)
    at createInjector (http://localhost:8000/app/lib/angular/angular.js:3007:11)
    at doBootstrap (http://localhost:8000/app/lib/angular/angular.js:1152:20)
http://errors.angularjs.org/1.2.0-rc.2/$injector/modulerr?p0=phonecatApp&p1…tp%3A%2F%2Flocalhost%3A8000%2Fapp%2Flib%2Fangular%2Fangular.js%3A1152%3A20) 
```

This is fixed by including the ngRoute in the angular.module definition.