content: import React from 'react';
  
  export default class Navigation extends React.Component {
    render () {
      if (this.props.authPending) {
        return <div></div>;  
      }
      
      if (this.props.isAuthenticated) {
        return <button className="navbar-toggle btn btn-default" onClick={ this.props.onSignOut }>Sign Out</button>;
      } else {
        return <button className="navbar-toggle btn btn-default" onClick={ this.props.onSignIn }>Sign In</button>
      }
    }
  }