Fix water animation and transparency

Water was not transparent and flowing water wasn't animated. I have added these features to the texture pack and I think it would be good if you used them.
![2013-05-04_08 43 50](https://f.cloud.github.com/assets/1957489/462238/b440a84a-b48e-11e2-8763-84aabf437afc.png)
![2013-05-04_08 45 23](https://f.cloud.github.com/assets/1957489/462239/bb37d1d2-b48e-11e2-9f28-9d115ca149f9.png)
![2013-05-04_08 45 36](https://f.cloud.github.com/assets/1957489/462241/bfedc916-b48e-11e2-9ef1-20e8fb1b85b0.png)