Change the way hash anchors are handled

For issue #14

This probably isn't a backwards compatible change but it fixes an issue I was having in IE<10 caused by HTML5-History-API translating URLs of the form /some/path to /#/some/path and iron-router not paying attention to anything after the hash in a URL. I'm creating this pull request to more to add to the discussion already happening around IE<10 than to propose a solution.