Apply ads + lists layout only if ad is present

This also restores a normal thumbnail ratio for people container.

![screen shot 2014-02-20 at 18 06 11](https://f.cloud.github.com/assets/85783/2221510/c3f0690e-9a59-11e3-99bf-b5dfd3a6f787.PNG)

![screen shot 2014-02-20 at 18 46 54](https://f.cloud.github.com/assets/85783/2221959/76e05cf4-9a5f-11e3-9cb0-6f6b07bd72da.PNG)



![ ](http://media.giphy.com/media/z5io3SM6BJeHS/giphy.gif)