Merge pull request #336 from purplecabbage/windowlevel

This lets the default window layering do it's thing.

src/ios/CDVUIInAppBrowser.m

@@ -258,8 +258,6 @@ - (void)show:(CDVInvokedUrlCommand*)command
             }
             UIViewController *tmpController = [[UIViewController alloc] init];
             [tmpWindow setRootViewController:tmpController];
-            double baseWindowLevel = [UIApplication sharedApplication].keyWindow.windowLevel;
-            [tmpWindow setWindowLevel:baseWindowLevel+1];
 
             [tmpWindow makeKeyAndVisible];
             [tmpController presentViewController:nav animated:YES completion:nil];