add react-router middleware

Nobody has claimed this yet.

The `README.md` gives an example of how you can use this with `applyRouterMiddleware`. Would it make more sense to provide your own middleware instead? Might look something like:

``` javascript
const useReduxAsyncConnect = (helpers, filters) => ({
renderRouterContext: (child, props) => (
{child}
)
})
```

and would be used like

``` javascript
const component = (
applyRouterMiddleware(useReduxConnect(helpers, filters), useScroll())}
history={history}
routes={getRoutes(store)}
/>
);
```

Start with the README.md example using applyRouterMiddleware and inspect how the package currently integrates with react-router. Compare that usage with the proposed useReduxAsyncConnect middleware shape and determine the expected behavior for helpers, filters, and renderRouterContext. Done means the middleware is provided and the README example reflects its use.

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