4.0.0-beta.8

• Fix: ‘clone’ scenes declared at the end were not visible for scenes declared above
• Enhancement: If component has static navigationOptions return it instead of RNRF generated options
• Enhancement: Allow all navBar properties (title, right, left, rightButtonImage, onRight, etc.) be defined as static functions/values of Scene component
• Fix: Actions.refresh was broken because navigationStore doesn’t allow the same scene after state change
• Enhancement: fix ESLint errors for tests
• Fix: avoid re-render of all scenes during navigation state change (#2018)
• Support rightButtonTextStyle and leftButtonTextStyle, avoid reset them to default values after push (after push from Login to Login2, "Cancel" became blue again)
• Fix: Support passing navbar attributes (like onRight/onLeft/leftTitle/rightTitle) via Actions.refresh
• Fix: postinstall somewhere doesn't work with npm (#2008)