Fix ForegroundColor is not reflected #324

### before `changeColor`

![ios 2014 08 25 17 57 52](https://cloud.githubusercontent.com/assets/537587/4027892/0585f2da-2c36-11e4-99f6-0745a838ab7e.png)

### after `changeColor`

![ios 2014 08 25 17 57 59](https://cloud.githubusercontent.com/assets/537587/4027897/0d0416b8-2c36-11e4-9341-3e8ae8564bc1.png)

### before fix

![ios 2014 08 25 17 46 12](https://cloud.githubusercontent.com/assets/537587/4027900/1aabee62-2c36-11e4-8917-13256d8161fd.png)