[Flow] Fix or suppress react-native github errors for Flow v0.12.0

Examples/UIExplorer/UIExplorerApp.ios.js

@@ -44,6 +44,9 @@ var UIExplorerApp = React.createClass({
       );
     }
       return (
+        /* $FlowIssue #7363964 - There's a bug in Flow where you cannot
+          * omit a property or set it to undefined if it's inside a shape,
+          * even if it isn't required */
         <NavigatorIOS
           style={styles.container}
           initialRoute={{