Article commercial tests

Places an commercial component inside the article body in one variant and in the MPU slot (right-hand column) in the second variant. We are tracking click-throughs on the ad server.

**inline**

![country-house](https://f.cloud.github.com/assets/84996/1840347/d35712e2-7490-11e3-8a0d-dd5b053a7c8c.png)

**mpu**

![mpu](https://f.cloud.github.com/assets/84996/1840362/2ed46be2-7491-11e3-9c02-a86f81419b12.png)