Add missing params for showInAppNotification (#1707)

* Add font family support on bottom tabs

* import missing classes

* import missing class

* update document

* Support customize icon for left nav button in android

* Add navBar navBarTextFontSize support for android

* Add missing parameter instruction for in app notification

* Merge changes as origin master

docs/screen-api.md

 this.props.navigator.showInAppNotification({
  screen: "example.InAppNotification", // unique ID registered with Navigation.registerScreen
  passProps: {}, // simple serializable object that will pass as props to the in-app notification (optional)
+ autoDismissTimerSec: 1 // auto dismiss notification in seconds
 });
 ```