Update forms for a related object now display a more intuitive title

if(this.href.indexOf(document.location) == -1) 
checks if the update url is related to the location. 
http://127.0.0.1:8000/core/system/ is in http://127.0.0.1:8000/core/system/1/update if it was not it would return -1
Fore example http://127.0.0.1:8000/core/system/1 is not in /http://127.0.0.1:8000/dhcp/dynamic_interface/1/update/ 
Therefore it adds an extra to the form title by grabbing objName which should exist in all base forms. This is the only issue I can see with this pull request.