[tutorial] propagating changes made to code resulting from update to 0.9.10

Changes induced by angular.dart.tutorial PR #108:
- Rename: `ViewFactory` to `RouteViewFactory`.
- Rename: `getRoute` to `findRoute'.
Merge pull request #55 from chalin/patch-0322-routes

[tutorial] propagating changes made to code resulting from update to 0.9.10