Match comments first so no color syntax is applied if another pattern matches

Before : 

![Before the fix](https://cloud.githubusercontent.com/assets/437946/4899871/755fbb6e-6420-11e4-8f80-f55e0ea98430.png)

After : 

![After the fix](https://cloud.githubusercontent.com/assets/437946/4899877/818b9796-6420-11e4-835a-f3eb171e996b.png)