fix for #877,878,880

ios/RNNRootViewController.m

 }
 
 /**
- *	fix for #877
+ *	fix for #877, #878
  */
 -(void)onJsReload {
+	[self cleanReactLeftovers];
+}
+
+/**
+ * fix for #880
+ */
+-(void)dealloc {
+	[self cleanReactLeftovers];
+}
+
+-(void)cleanReactLeftovers {
 	[[NSNotificationCenter defaultCenter] removeObserver:self];
 	[[NSNotificationCenter defaultCenter] removeObserver:self.view];
 	self.view = nil;

ios/ReactNativeNavigation.m

 # pragma mark - js events
 
 -(void)onJavaScriptWillLoad {
-	[self releaseBeforeJSReload];
 	[_store clean];
 }
 
 											   object:nil];
 }
 
--(void)releaseBeforeJSReload {
-#ifdef DEBUG
-//	if(![UIApplication.sharedApplication.delegate.window.rootViewController isKindOfClass:[RNNSplashScreen class]]) {
-//		[self releaseBeforeJsReload:UIApplication.sharedApplication.delegate.window.rootViewController];
-//	}
-#endif
-}
-
-//-(void)releaseBeforeJsReload:(UIViewController*)vc {
-//	if(!vc) return;
-//	
-//	for (UIViewController* child in vc.childViewControllers) {
-//		[self releaseBeforeJsReload:child];
-//	}
-//	[self releaseBeforeJsReload:vc.presentedViewController];
-//	
-//	[NSNotificationCenter.defaultCenter removeObserver:vc];
-//	[NSNotificationCenter.defaultCenter removeObserver:vc.view];
-//	vc.view = nil;
-//}
-
 @end

playground/src/containers/ModalScreen.js

   }
 
   onClickDismissAllModals() {
-    // Navigation.dismissAllModals();
-    Navigation.setRoot({
-      container: {
-        name: 'navigation.playground.WelcomeScreen'
-      }
-    });
+    Navigation.dismissAllModals();
   }
 
   getModalPosition() {