Fix resetTo in SingleScreenApp

fixes #226

android/app/src/main/java/com/reactnativenavigation/layouts/SingleScreenLayout.java

 
     @Override
     public void newStack(ScreenParams params) {
-        RelativeLayout parent = sideMenu == null ? this : sideMenu.getContentContainer();
-        createStack(parent);
+        removeView(stack.peek());
+        stack.destroy();
+
+        ScreenStack newStack = new ScreenStack(activity, getScreenStackParent(), params.getNavigatorId(), this);
+        LayoutParams lp = new LayoutParams(MATCH_PARENT, MATCH_PARENT);
+        newStack.pushInitialScreenWithAnimation(params, lp);
+        stack = newStack;
+
         EventBus.instance.post(new ScreenChangedEvent(params));
     }