Suport for component type

[marcioj]

Angular 1.5 supports a new type called component which is just a layer on top of directive.
Like directive, component has a property called controller which we need to annotate. Ex:

angular.module('app', [])
  .component('greeter', {
    bindings: {
      message: '='
    },
    controller: function (GreeterService) {
      this.message = GreeterService.getMessage();
    },
    template: '<h1>{{$ctrl.message}}</h1>'
  });