Modal spacing & warning colour

Closes #4583

- Adds a `.red` class (used to make the post count red)
- Adds a little spacing under the modal header to things arent bunched up

![screen shot 2014-12-12 at 10 49 19](https://cloud.githubusercontent.com/assets/390392/5410469/c78bba0c-81ec-11e4-8cf6-2b9708d7ba26.png)