Fixes compilation error

The original file contained:

```
    /**
    * A component that renders a React Router app using router state from a Redux store.
    */
    export class ReactRouter { }
```

The exported ``ReactRouter ` class is empty but it is supposed to be the ReactRouter. 

I removed the empty class and exported the the ReactRouter instead:

```
declare module "redux-router/lib/ReduxRouter" {
    import Router from "react-router";
    export default Router;
}
```

redux-router/redux-router.d.ts

@@ -16,10 +16,6 @@ declare namespace __ReduxRouter {
     */
     export class ReduxRouter extends React.Component<any, any> { }
     /**
-    * A component that renders a React Router app using router state from a Redux store.
-    */
-    export class ReactRouter { }
-    /**
     * A Redux store enhancer that adds router state to the store.
     */
     export var reduxReactRouter: any;
@@ -46,7 +42,8 @@ declare module "redux-router/lib/routerStateReducer" {
 }
 
 declare module "redux-router/lib/ReduxRouter" {
-    export default __ReduxRouter.ReactRouter;
+    import Router from "react-router";
+    export default Router;
 }
 
 declare module "redux-router/lib/client" {