Proposal: Add static WrappedComponent to allow access to the original component

[jshthornton]

This will allow a developer to access the original component which might be important if that component itself exposes a wrapped component.

For example, take redux-form. When wrapping a stateless component with redux-form you can access it via MyForm.WrappedComponent, rather than having to export it yourself. When writing a story it would be good to be able to just render the stateless form without having to export it separately or putting it in a separate file.

I can put it into a pull request if you agree with the concept?