Assigning Controllers (Y038)

https://github.com/johnpapa/angularjs-styleguide/edit/master/README.md
- When a controller must be paired with a view and either component may be re-used by other controllers or views, define controllers along with their routes.

Note: If a View is loaded via another means besides a route, then use the `ng-controller="Avengers as vm"` syntax.

_Why?_: Pairing the controller in the route allows different routes to invoke different pairs of controllers and views. When controllers are assigned in the view using [`ng-controller`](https://docs.angularjs.org/api/ng/directive/ngController), that view is always associated with the same controller.

``` javascript
/* avoid - when using with a route and dynamic pairing is desired */

// route-config.js
angular
.module('app')
.config(config);

function config($routeProvider) {
$routeProvider
.when('/avengers', {
templateUrl: 'avengers.html'
});
}
```

``` html

```

``` javascript
/* recommended */

// route-config.js
angular
.module('app')
.config(config);

function config($routeProvider) {
$routeProvider
.when('/avengers', {
templateUrl: 'avengers.html',
controller: 'Avengers',
controllerAs: 'vm'
});
}
```

``` html


```