[WIP] update for AngularDart 1.x

@kwalrath could you please review when you are available.

/ref https://github.com/angular/angular.dart.tutorial/pull/131
Because we use semver any version in the 1.x (or 1.x.) branch is backward compatible - the tutorial will not need to be updated before v2.

You're right, I forgot to updated the content for each chapter, will do