Use getInitialProps API instead of breaking CWM

[djgrant]

To enable custom renderers to resolve a component's data requirements asynchronously, react-quest currently expects the render to resolve componentWillMount(). This is not suitable as it breaks the react component contract. A better solution - one that the community seems to have converged on - is extending the component contract with a getInitialProps method.

Related: FormidableLabs/rapscallion#51 (comment)