Fix disqus URLs.

_layouts/post.html

@@ -20,7 +20,7 @@ layout: base
         var disqus_shortname = 'earwig';
         var disqus_identifier = '{{ page.id }}';
         var disqus_title = '{{ page.title }}';
-        var disqus_url = 'http://earwig.github.com{{ page.url }}';
+        var disqus_url = '{{ site.url }}{{ page.url }}';
         var disqus_developer = 1;
         (function() {
             var dsq = document.createElement('script'); dsq.type = 'text/javascript'; dsq.async = true;

index.html

@@ -126,7 +126,7 @@ title: Home
 <script>
     var disqus_shortname = 'earwig';
     var disqus_title = '{{ page.title }}';
-    var disqus_url = 'http://earwig.github.com{{ page.url }}';
+    var disqus_url = '{{ site.url }}{{ page.url }}';
     var disqus_developer = 1;
     (function () {
         var s = document.createElement('script'); s.async = true;