Adjust text in selected in depth 1, according zoom ratio.

#201 

![screen shot 2014-02-09 at 2 18 07 pm](https://f.cloud.github.com/assets/2622152/2119737/59993618-9184-11e3-9989-25f41c41e6e2.png)
![screen shot 2014-02-09 at 2 18 16 pm](https://f.cloud.github.com/assets/2622152/2119738/5bb3f780-9184-11e3-83dd-1fb806aca5cb.png)
![screen shot 2014-02-09 at 2 18 25 pm](https://f.cloud.github.com/assets/2622152/2119739/5e2e208a-9184-11e3-806f-fa5b6f0d5bdf.png)