docs updated and setStackRoot fix

docs/docs/screen-api.md

 Navigation.popToRoot(this.props.componentId);
 ```
 
-<!-- ## resetTo(params)
+## setRootStack(componentId, params)
 
-Reset the screen's navigation stack to a new screen (the stack root is changed).
+Reset the current navigation stack to a new screen component (the stack root is changed).
 
 ```js
-this.props.navigator.resetTo({
-  screen: 'example.ScreenThree', // unique ID registered with Navigation.registerScreen
-  title: undefined, // navigation bar title of the pushed screen (optional)
-  passProps: {}, // simple serializable object that will pass as props to the pushed screen (optional)
-  animated: true, // does the resetTo have transition animation or does it happen immediately (optional)
-  animationType: 'fade', // 'fade' (for both) / 'slide-horizontal' (for android) does the resetTo have different transition animation (optional)
-  navigatorStyle: {}, // override the navigator style for the pushed screen (optional)
-  navigatorButtons: {} // override the nav buttons for the pushed screen (optional)
+Navigation.setRootStack(this.props.componentId, {
+  component: {
+        name: 'example.NewRootScreen',
+        passProps: {
+          text: 'Root screen'
+        },
+        options: {
+          animated: true // Will animate root change same as push
+        }
+      }
 });
-``` -->
+```
 
 ## showModal(layout = {})
 

docs/docs/top-level-api.md

 });
 ```
 
-## startSingleScreenApp(params) -> setRoot({stack})
-
-Change your app root into an app based on a single screen (like the iOS Calendar or Settings app). The screen will receive its own navigation stack with a native nav bar
-
-```js
-Navigation.setRoot({
-  stack: {
-    children: [{
-      component: {
-        name: 'example.WelcomeScreen',
-        passProps: {
-          text: 'stack with one child'
-        }
-      }
-    }],
-    options: {
-      topBar: {
-        title: {
-          text: 'Welcome screen'
-        }
-      }
-    }
-  }
-});
-```
-
-## showModal(params = {}) -> showModal(layout = {})
+## showModal(layout = {})
 
 Show a screen as a modal.
 
 });
 ```
 
-## dismissModal(params = {}) -> dismissModal(componentId)
+## dismissModal(componentId)
 
 Dismiss the current modal.
 
 Navigation.dismissModal(this.props.componentId);
 ```
 
-## dismissAllModals(params = {}) -> dismissAllModals()
+## dismissAllModals()
 
 Dismiss all the current modals at the same time.
 

lib/ios/RNNNavigationStackManager.m

 		}
 	}];
 	
-	[nvc setViewControllers:@[newRoot] animated:newRoot.options.animated];
+	[nvc setViewControllers:@[newRoot] animated:[newRoot.options.animated boolValue]];
 	
 	[CATransaction commit];
 }

playground/src/screens/PushedScreen.js

           previousScreenIds: _.concat([], this.props.previousScreenIds || [], this.props.componentId)
         },
         options: {
+          animated: true,
           topBar: {
             title: {
               text: `Pushed ${this.getStackPosition() + 1}`