Currently if React is not loaded, ReactDOM shows this:

<img width="664" alt="screen shot 2017-08-08 at 3 36 52 pm" src="https://user-images.githubusercontent.com/810438/29077217-784c7624-7c4f-11e7-88bc-b055407523a9.png">

We should throw a nicer error message in the entry point I think.
componentDidMount() {
          ops.push(`${this.props.name} componentDidMount`);
        }
        componentDidUpdate() {
          ops.push(`${this.props.name} componentDidUpdate`);
        }
        componentWillUnmount() {
          ops.push(`${this.props.name} componentWillUnmount`);
        }
        render() {
          return <div>{this.props.name}</div>;
        }
      }
      class Parent extends React.Component {
        componentDidMount() {