Andoid "home and overview buttons" effect after click on ads

[orah29]

With the sample project supplied with the plugin, after clicking on ads (banner or interstitial) :
if I press on home/overview button, the app closes;
if I press on back button, I return on ads. Then I close the ads to return to the app.
How to fix this?
Thanks in avance

[gumaciel]

See #187