Add discus commenting

Author: christopherthielen

_config.yml

@@ -18,7 +18,7 @@ teaser                   : # filename of teaser fallback teaser image placed in
 comments:
   provider               : "disqus"
   disqus:
-    shortname            : # https://help.disqus.com/customer/portal/articles/466208-what-s-a-shortname-
+    shortname            : "ui-router" # https://help.disqus.com/customer/portal/articles/466208-what-s-a-shortname-
   facebook:
     # https://developers.facebook.com/docs/plugins/comments
     appid                :