Revert "Move examples to https://github.com/react-navigation/examples"

This reverts commit 36775007b0.

examples/ReduxExample/src/components/AuthButton.js

@@ -0,0 +1,30 @@
+import React from 'react';
+import PropTypes from 'prop-types';
+import { connect } from 'react-redux';
+import { Button } from 'react-native';
+import { NavigationActions } from 'react-navigation';
+
+const AuthButton = ({ logout, loginScreen, isLoggedIn }) => (
+  <Button
+    title={isLoggedIn ? 'Log Out' : 'Open Login Screen'}
+    onPress={isLoggedIn ? logout : loginScreen}
+  />
+);
+
+AuthButton.propTypes = {
+  isLoggedIn: PropTypes.bool.isRequired,
+  logout: PropTypes.func.isRequired,
+  loginScreen: PropTypes.func.isRequired,
+};
+
+const mapStateToProps = state => ({
+  isLoggedIn: state.auth.isLoggedIn,
+});
+
+const mapDispatchToProps = dispatch => ({
+  logout: () => dispatch({ type: 'Logout' }),
+  loginScreen: () =>
+    dispatch(NavigationActions.navigate({ routeName: 'Login' })),
+});
+
+export default connect(mapStateToProps, mapDispatchToProps)(AuthButton);