Fix margin around headline byline

Before: 

![screen shot 2014-10-20 at 16 07 07](https://cloud.githubusercontent.com/assets/813383/4703458/4445f234-586b-11e4-8787-d69ad3d6f01a.png)
![screen shot 2014-10-20 at 16 07 35](https://cloud.githubusercontent.com/assets/813383/4703461/47fcf148-586b-11e4-81c8-19c4796dbed9.png)

After:
![screen shot 2014-10-20 at 16 07 18](https://cloud.githubusercontent.com/assets/813383/4703463/4ca3e9c2-586b-11e4-8368-8aded6cb942a.png)
![screen shot 2014-10-20 at 16 07 52](https://cloud.githubusercontent.com/assets/813383/4703465/538b7aca-586b-11e4-93a8-dfc128c19dd7.png)