Advertising with Project Wonderful

We've selected [Project Wonderful](https://www.projectwonderful.com/) as our ad provider. They are supportive of user privacy and are a good service in general.

Screenshot dump:

![2014-04-09_20 49 25](https://cloud.githubusercontent.com/assets/1310872/2663481/de67ec18-c05a-11e3-8d46-ad612895252f.png)
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![2014-04-09_20 48 56](https://cloud.githubusercontent.com/assets/1310872/2663482/de686800-c05a-11e3-820a-0607c27f46c3.png)
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![2014-04-09_20 48 39](https://cloud.githubusercontent.com/assets/1310872/2663483/de688e66-c05a-11e3-9a3d-07665f6d557a.png)
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![2014-04-09_20 49 02](https://cloud.githubusercontent.com/assets/1310872/2663484/de689546-c05a-11e3-9005-2da9202b339d.png)
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![2014-04-09_20 49 17](https://cloud.githubusercontent.com/assets/1310872/2663485/de68b846-c05a-11e3-9531-f3dbcb6093ed.png)
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![2014-04-09_20 48 30](https://cloud.githubusercontent.com/assets/1310872/2663486/de68cef8-c05a-11e3-84bb-791f96758f20.png)
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![2014-04-09_20 50 05](https://cloud.githubusercontent.com/assets/1310872/2663487/ded48440-c05a-11e3-810d-55fe08ba9268.png)

@jdiez17 Ready to merge, but use caution. This change requires manual intervention. Our Project Wonderful ID is 72888 (for `config.ini`).