Fix nginx syntax

Using `conf` is good idea, isn't it?

![1](https://f.cloud.github.com/assets/5597094/1747650/cb444cfe-6465-11e3-8f11-07ad935e701b.png)
![2](https://f.cloud.github.com/assets/5597094/1747651/cb6af69c-6465-11e3-817e-06365a38e872.png)