Commercial admin add google

Updates the list of example Fluid 250 / Expandable campaigns.

Also adds explanations of what each example shows.

Before;
![screen shot 2014-11-13 at 10 25 47](https://cloud.githubusercontent.com/assets/1303616/5026786/7e5db7d8-6b1f-11e4-97ec-cbcce76ff1f6.png)

After;
![screen shot 2014-11-13 at 10 25 57](https://cloud.githubusercontent.com/assets/1303616/5026788/860a79bc-6b1f-11e4-93ad-fb1b6557980e.png)