Merge pull request #295 from gcox/master

Fixed bug preventing ASIAuthenticationDialog from being dismissed on iOS5

@@ -216,6 +216,9 @@ static const NSUInteger kDomainSection = 1;
 
 + (void)dismiss
 {
+	if ([sharedDialog respondsToSelector:@selector(presentingViewController)])
+		[[sharedDialog presentingViewController] dismissModalViewControllerAnimated:YES];
+	else 
 		[[sharedDialog parentViewController] dismissModalViewControllerAnimated:YES];
 }
 
@@ -233,6 +236,9 @@ static const NSUInteger kDomainSection = 1;
 	if (self == sharedDialog) {
 		[[self class] dismiss];
 	} else {
+		if ([self respondsToSelector:@selector(presentingViewController)])
+			[[self presentingViewController] dismissModalViewControllerAnimated:YES];
+		else
 			[[self parentViewController] dismissModalViewControllerAnimated:YES];
 	}
 }