UC-156 Update antispoof to work against the user DB

* Also fix up the UserSignupAjaxForm.js

https://wikia-inc.atlassian.net/browse/UC-156
Yah, $nt is used in a lot of places for Title objects and its not super clear unless you've seen it over and over again.  I don't really like ```$title``` because its never clear whether its an actual textual title or a title object (they get used interchangeably so often).  Using ```$titleObj``` is an option, though I don't like adding type to variable names.  I choose ```userTitle```