Update redirection.md

transitionTo is deprecated, updating to transitionToRoute for Ember 1.0.0-rc.6.x
![2013-08-05-110818_1439x294_scrot](https://f.cloud.github.com/assets/339040/912082/0c4a3218-fdfa-11e2-8b17-ae7e8678f736.png)