Change set sprite "mood" to "emotion"

![image](https://cloud.githubusercontent.com/assets/206973/3528339/4262de60-078e-11e4-88a7-4b4e30e69eff.png)

![image](https://cloud.githubusercontent.com/assets/206973/3528359/8705656a-078e-11e4-810a-24fe980fa680.png)