Updated sample project to include support for pushing content up/down when an add appears/disappears. In this example, a button is placed at the bottom of the screen when an ad shows or hides itself. It also works when an ad of different size appears, such as when an Admob ad is shown after an iAd ad is shown.
Merge pull request #52 from kingsapo/push-content-up-when-ad-appears

Updated sample project to include support for pushing content up/down when ad appears or disappears.