A/B Test: 300x250 MPU on mobile

On fronts and articles

![screen shot 2014-06-17 at 18 05 35](https://cloud.githubusercontent.com/assets/74132/3303641/a2ea23e6-f641-11e3-963d-71ceeb3bcde8.png)

This doesn't map to the end date in your ab test, on purpose?