Add documentation

Hi,

As a reference for others, I think it would be helpful to add the following example to the readme.

// ./containers/User.js
import { asyncConnect } from 'redux-connect'
import { loadUserSession } from '../actionCreators/session'
import User from '../components/User'

const mapStateToProps = (state, ownProps) => {
	// ... as per redux docs
};

const mapDispatchToProps = (dispatch/*, ownProps*/) => {
	// ... as per redux docs
};

const preloadDataActions = [{
        // dispatch actions here required to preload data for the component to render
	promise: ({ params, store: { dispatch }, location }) => {
		return dispatch(loadUserSession(params));
	}
}];

export default asyncConnect(
	preloadDataActions,
	mapStateToProps,
	mapDispatchToProps
)(User);

This approach allows you to isolate all redux related behaviors to a container, without the need to pollute the component code.

IMHO, i think this is a cleaner approach then using the decorator pattern. Helpful if you want to use packaged components without access to the component source.

Want me to submit a PR?

Adam.