6. Implement event listeners for VDOInterstitialListenerDelegate.


-(void)onInterstitialLoaded:(LVDOInterstitialView*)interstitialAd;

-(void)onInterstitialFailed:(LVDOInterstitialView*)interstitialAd errorCode:(int)errorCode ;

-(void)onInterstitialShown:(LVDOInterstitialView*)interstitialAd;

-(void)onInterstitialClicked:(LVDOInterstitialView*)interstitialAd;

-(void)onInterstitialDismissed:(LVDOInterstitialView*)interstitialAd;