Fix URL in comment posting JavaScript
Fix URL in comment posting JavaScript

window.location.hostname doesn't include the port. window.location.host
does.

See here: http://bl.ocks.org/3070589
(cherry-picked from 9fe3b55)

Spotweb/Spotweb,tswestendorp/spotweb,gijsroge/spotweb,riksmith/Spotweb,rodikal/Spotweb,mbirth/spotweb,GeoffreyDijkstra/spotweb,mesa57/spotweb,GeoffreyDijkstra/spotweb,tswestendorp/spotweb,riksmith/Spotweb,the-darkvoid/spotweb,mesa57/spotweb,the-darkvoid/spotweb,mbirth/spotweb,Spotweb/Spotweb,rodikal/Spotweb,LeeThompson/spotweb,gijsroge/spotweb,LeeThompson/spotweb,isuftin/spotweb-1,isuftin/spotweb-1