No min-height on articles' sponsored badges

### Before

![screen shot 2014-11-19 at 15 56 28](https://cloud.githubusercontent.com/assets/74132/5108758/a4989bb8-7004-11e4-8323-40ba063c0135.png)

### After

![screen shot 2014-11-19 at 15 56 31](https://cloud.githubusercontent.com/assets/74132/5108760/a87699c4-7004-11e4-89f0-611f2a6dcb5c.png)

cc: @Pearson82 

$gs-baseline * 2