Ie8 page load

@mridgway @redonkulus @Vijar 

This PR is to support loading hash URLs in IE8, e.g. `http://localhost:3000/?#/sports/news/falcons-rb-jackson-sidelined-hamstring-230428564--nfl.html`.

Since hash fragment is not sent to the server side, we need to dispatch a NAVIGATE action on the client side, which is sent to flux app store.  The store then can map the request to the correct route via [routr](https://github.com/yahoo/routr).