title: How to record the affliate ID of a person registered via meteor's accounts-ui and accounts-password
body: <p>meteor's accounts-ui and accounts-password will work fine for my purposes except for one thing: when a user registers, I want to record who referred that user based on a query string parameter of <code>sponsor</code>, e.g. <code>www.mysite.com/?sponsor=bob</code>  ... is there a way to extract and record that information along with the newly registered user?</p>