AI liquid dispenser sprite update

![ss 2014-09-26 at 05 21 02](https://cloud.githubusercontent.com/assets/7247232/4429128/dee2b7d8-45dc-11e4-9c97-17f7a236bd09.png)

![off](https://cloud.githubusercontent.com/assets/7247232/4429129/e0918c62-45dc-11e4-9dfd-ca15fa43c42a.gif)
![on](https://cloud.githubusercontent.com/assets/7247232/4429130/e1d74882-45dc-11e4-90bf-29edb32babd7.gif)
![active](https://cloud.githubusercontent.com/assets/7247232/4429131/e30dc794-45dc-11e4-91ba-a06cfffb5f9d.gif)