[Flow] Fix or suppress errors in react-native for Flow v0.13.0

Examples/UIExplorer/TextInputExample.js

@@ -133,6 +133,7 @@ var styles = StyleSheet.create({
   },
 });
 
+exports.displayName = (undefined: ?string);
 exports.title = '<TextInput>';
 exports.description = 'Single and multi-line text inputs.';
 exports.examples = [