backbone_pushstate_router.js

// Only need this for pushState enabled browsers
if (Backbone.history && Backbone.history._hasPushState) {
  var $document = $(window.document);
  var openLinkInTab = false;

  $document.keydown(function(e) {
    if (e.ctrlKey || e.keyCode === 91) {
      openLinkInTab = true;
    }
  });

  $document.keyup(function(e) {
    openLinkInTab = false;
  });

  $document.on("click", "a", function(e) {
    var $this = $(this);
    var href = $this.attr("href");
    var domain = $this.prop("hostname");

    // if the href is not equal to outpost.travel
    var isCSRF = domain !== window.document.location.hostname;
    var hasHashLink = href.indexOf("#") === -1;

    // if it's been indicated that we don't want to open in a new tab
    // and that the link is the same domain then preventDefault
    // protection againts internal #div links
    if (!openLinkInTab && !isCSRF && hasHashLink) {
      e.preventDefault();
      Backbone.history.navigate(href, true);
    }
  });
}

to be inserted after jQuery/Backbone has been loaded, and after this line:

Backbone.history.start({pushState: true});

Thanks for sharing this. YMMV but i needed to support using Backbone.history.root to deal with my app not being at the / root of the domain.

I also cleared up a couple things I found confusing and missing:
https://gist.github.com/shaneharter/c1458d8ddf504515c244