title: React propTypes errors not showing
body: <p>I'm having problems with React propTyoes. I'v created a component that require 2 props to work as you guys can see in the code below.</p>
  
  <p>When I use the component in the <strong>App</strong> file, passing just 1 prop, without the "stateSidebarVisible" it doesn't throw me any error/warning from react...
  (I read a lot of things about the NODE_ENV production/development, I searched in my node for process.env and didnt found the NODE_ENV variable by the way).
  Any clue? </p>
  
  <p><strong>FFMainHeader</strong></p>
  
  <pre><code>export default class FFMainHeader extends React.Component {
    render() {...}
  }
  
  FFMainHeader.propTypes = {
    stateSidebarVisible: React.PropTypes.bool.isRequired,
    handleSidebarChange: React.PropTypes.func.isRequired
  };
  </code></pre>
  
  <p><strong>App</strong></p>
  
  <p>This is where i call the FFMainHeader component.</p>
  
  <pre><code>export default class FFMainApp extends React.Component {
      .......
      render() {
          return (
              &lt;div id="FFMainApp"&gt;
                  &lt;FFMainHeader
                      handleSidebarChange={this.onSidebarChange} /&gt;
                  &lt;FFMainSidebar /&gt;
              &lt;/div&gt;
          );
      }
  }
  </code></pre>
  
  <p><strong>EDIT</strong></p>
  
  <pre><code>export default class FFMainHeader extends React.Component {
  
    constructor(props) {
      super(props);
      this.clickSidebarChange = this.clickSidebarChange.bind(this);
    }
  
    clickSidebarChange(e) {
      e.preventDefault();
      (this.props.stateSidebarVisible) ?
        this.props.stateSidebarVisible = false :
        this.props.stateSidebarVisible = true;
      this.props.handleSidebarChange(this.props.stateSidebarVisible);
    }
  
    render() {
      return (
        &lt;header id="FFMainHeader"&gt;
          &lt;a href="#" onClick={this.clickSidebarChange}&gt;
            Abre/Fecha
          &lt;/a&gt;
        &lt;/header&gt;
      );
    }
  }
  
  FFMainHeader.propTypes = {
    stateSidebarVisible: React.PropTypes.bool.isRequired,
    handleSidebarChange: React.PropTypes.func.isRequired
  };
  </code></pre>