make textView flexible

fix #11 

![2014-10-17_14-19-55](https://cloud.githubusercontent.com/assets/19714/4674748/aceb9402-5608-11e4-8964-c4e850b3d99e.jpg)

![2014-10-17_14-20-50](https://cloud.githubusercontent.com/assets/19714/4674755/cdc35d04-5608-11e4-9f7c-f7868ea84e6a.jpg)