feat(examples/index.template): allow ng-app to be defined in the example
feat(examples/index.template): allow ng-app to be defined in the example

By setting the ng-app-included attribute to true on an example we can
have the ng-app directive appear inside the example text rather than
being added externally to the generated index.html.

This is useful in examples that are actually show-casing the ng-app
functionality.

See https://github.com/angular/angular.js/pull/6639

angular/dgeni-packages,petebacondarwin/dgeni-packages,petebacondarwin/dgeni-packages,angular/dgeni-packages,angular/dgeni-packages,petebacondarwin/dgeni-packages